Are England in shape for South Africa?
As England prepare to take on the United States in an area rich in platinum mines, Capello now has just a few short weeks to polish the gems in his collection in readiness for the country's latest attempt to claim the World Cup for the first time since 1966.
Capello is trying to bridge a 44-year gap that has become a constant source of hope, expectation and ultimately disappointment. So how does England's squad stand as the clock ticks closer to kick-off in South Africa?
Will Adam Johnson be a surprise inclusion in England's World Cup squad - photo: AFP
Uneasily might be the first word that springs to mind, as Capello openly betrays his uncertainty about England's defensive resources by picking Tottenham captain Ledley King - despite his unorthodox regime of interrupting rest for his ravaged knees by playing football matches at elite level.
And even more so by the renewed courting of Jamie Carragher, who is being tempted out of self-imposed England exile and into the same circumstances that forced him there in the first place, namely by accepting his lot as fourth-choice central defender and deputy right-back, this time to his Liverpool team-mate Glen Johnson.
Capello will hope the next four weeks bring the stability and continuity required to plan for success in South Africa.
England's supporters can at least rest easy in the knowledge that they have a coach who is spectacularly unmoved by the heavy load of history and expectation that will accompany the squad on their flight out of London at the start of June.
Capello's clear-headed, ruthless, and pragmatic approach is among his greatest strengths and he detached himself from any emotion involved in the sport's greatest showpiece long ago.
He said: "I have tried to take a detached view from this 'not having won in 44 years' idea. When I first got here we had this Croatian ghost after England did not qualify for Euro 2008.
"I hope the same thing happens with the ghost of '66. I like the 'Ghostbusters' idea. Let's go with that because I want to take this team as far as possible."
What Capello cannot separate himself from are the doubts still surrounding key elements of his team as they try to banish the spectre of Wembley in 1966 and create new glories.
England go into the campaign with question marks hanging over the quality of their goalkeepers. Brazil's legendary 1970 team may have had enough world-class quality stamped through it to cope with the handicap of a comedy keeper in the hapless figure of Felix. The same hardly applies to England.
And the fear remains that Capello's lack of an undisputed and utterly reliable first-choice will return to haunt England when it matters most in South Africa.
David James will feel he is in prime position to start - a tribute to the Portsmouth keeper's longevity but arguably just as much of a condemnation of his rivals who have failed to see off the challenge of a man who will be 40 in August.
Joe Hart, the outstanding English goalkeeper this season, appears to be regarded as too inexperienced to be handed the gloves against the United States, although his ability to take a penalty may add to his credentials as the World Cup progresses.
Robert Green had mixed fortunes at West Ham United this season, while James has another chance to show his ability on the big stage when Portsmouth round off their traumatic season against Chelsea in the FA Cup final.
No-one doubts James' natural ability, but his reliability has always been a matter for debate. It is a flaw he will not cure now and it is to be hoped it is not on the agenda in South Africa.
Capello's defence, on paper, looks settled. John Terry and Rio Ferdinand in the centre with Glen Johnson and Ashley Cole on the flanks. It is, however, hardly an area free from worries.
Johnson has not justified the £17m Liverpool manager Rafael Benitez handed over to Portsmouth last summer. Johnson has been, well, Johnson. He is an impressive attacking talent but remains highly vulnerable defensively.
Some of his more uncertain moments, especially in Liverpool's unsuccessful campaigns in the Champions League and Europa League, will have been duly noted by any potential England opponents.
Terry and Ferdinand have been England's trusted bedrock for years, and while they represent the mark of quality, Capello will require hard evidence over the next few weeks that the troubles they have had are behind them.
Ferdinand, who assumed the captaincy stripped from Terry, has no doubters on grounds of class. He remains one of the game's most enduring world-class defenders, but his fitness has been a source of concern for some months both with club and country.
If Ferdinand stays fit, he will play a huge part in any success England enjoy - and Capello will keep everything crossed that this is the case.
It has been suggested that personal problems have driven at the heart of Terry's form, a charge vehemently denied by the player himself.
And for all the criticism he has received for the occasional off-colour performance, he has captained Chelsea to the title and has the opportunity of leading them to an historic Double. This alone suggests there is enough gas left in Terry's tank.
But when no less an authority on defensive matters than BBC football pundit Alan Hansen is prepared to declare that Terry has had an "indifferent season" then you understand why he will come under close scrutiny.
Capello will need to construct his cover for Ferdinand and Terry carefully, and this is where King comes in. A freak of nature, King is able to defy the difficulty of being unable to train and still deliver quality performances when it matters.
Spurs' boss Harry Redknapp believes the World Cup's format and gaps between games, particularly early on, will suit King's recovery period and after watching him perform at Manchester United and Manchester City in recent weeks, it is easy to see why Capello appears prepared to make an exception for his obvious fitness problems.
Carragher's potential presence in South Africa is more of a surprise, especially given his resolve never to play for England again after retiring during the Steve McClaren era.
Capello, a man happy to select players for today because tomorrow might never come
in a World Cup, admires the backs-to-the-wall defensive style of Carragher, but again it underlines worries about the form and fitness of West Ham United's Matthew Upson and Manchester City's Joleon Lescott, who has suffered on both counts this season.
Capello has no worries at left-back, not as the world-class Ashley Cole is restored to full working order. He remains a truly outstanding defender and someone the Italian can count on against any opponent.
Wayne Bridge's decision to retire from England duty after allegations Terry had a relationship with his former girlfriend was agonising personally, but hardly a seismic blow for England. Everton's Leighton Baines is the better player and would prove a more than able deputy for Cole if needed.
England's midfield is laced with quality, but once again Capello will have to perform a delicate balancing act, given his publicly stated intention to go with two forwards at all times in the shape of Wayne Rooney and one other.
Capello likes Frank Lampard in the centre with Steven Gerrard pushing in from the left flank to support England's two strikers. Will the injury suffered by Gareth Barry, a constant during the Capello reign, affect his thinking?
Michael Carrick has had an undistinguished season at Manchester United, so who Capello trusts to be Barry's replacement - or if he switches Gerrard into a more central role and starts the old debate about whether he can play with Lampard - will be intriguing.
Aston Villa's James Milner has shown the intelligence and versatility to be considered for this vital position if Barry is ruled out, but Capello may want this rapidly developing young player for other work.
Spurs' midfielder Tom Huddlestone and West Ham's Scott Parker have their backers, but it would be a major surprise if they jumped from relative obscurity straight into a World Cup campaign. The same applies to Owen Hargreaves after his lengthy injury absence.
Capello have plenty of options on the flanks, but who is making the most forceful case for inclusion, especially with David Beckham removed from the equation?
Arsenal's Theo Walcott is liked and trusted by Capello, but he has hardly shone at the Emirates in an injury-troubled campaign, while across north London at White Hart Lane Aaron Lennon appeared to be on the brink of making the position on the right side his own until he was struck down by injury.
Walcott was the shock - make that nonsensical - inclusion by Sven-Goran Eriksson in England's 2006 World Cup squad, and there is growing support for Manchester City's Adam Johnson to board the plane to South Africa.
Glen Johnson has been a regular starter for England but has faced criticism - photo: AFP
He is tall, two-footed and can deliver quality crosses with consistency. My only worry about Johnson is that he has tired consistently in games where I have seen him this season. Stamina may be a factor, but he is a very gifted player, certainly my preferred option to his Eastlands colleague Shaun Wright-Phillips.
In attack it is as much a case of a prayer as a question. Will Wayne Rooney stay fit? If he does not, then while England's World Cup chances would not be wiped out completely they would suffer a devastating blow.
The likelihood is that he will be partnered in attack by Emile Heskey, despite the lack of anything to go on from the Aston Villa striker this season. Sunderland's Darren Bent has made a much more compelling case for inclusion, but there seems to be a school of thought that he is not an England player.
I would take Bent ahead of Heskey every time - and I would use 24 Premier League goals against three as Exhibit A to press my case - but the latter's supporters point to England's successes with him in the side and it is difficult to argue against it.
Jermain Defoe and Peter Crouch will be the other strikers, although it will be interesting to see if Capello resists the temptation to take a fifth striker in his final squad of 23.
So, one month to go and plenty for Capello to pore over - the good news for England supporters is that he has proved he has an uncanny knack of making the big calls correctly.
Do it again and Capello the "Ghostbuster" will be in good shape for a serious tilt at World Cup glory.