Atletico Madrid 2 - 0 Celtic
Celtic's Europa League group campaign opened with defeat as they failed to test Atletico Madrid in Spain.
Falcao took advantage of some slack marking to head the home side ahead from a third-minute corner.
Gary Hooper had an early effort blocked and, early in the second half, Ki Sung-yueng's powerful drive had to be tipped over the bar by Thibaut Courtois.
Atletico put the game beyond Celtic when Diego ran on to Arda Turan's cut-back to shoot home.
Not for the first time on their recent European travels, Celtic conceded a soft early goal.
A good sliding challenge from Charlie Mulgrew gave away a corner and Colombian striker Falcao ran between two defenders to powerfully head Diego's delivery home from 10 yards.
Celtic had a great chance to draw level just a few minutes later when Hooper exchanged swift passes with stand-in skipper Beram Kayal. However, Atletico goalkeeper Thibaut Courtois rushed out to block as the striker got the ball caught under his feet.
With the visitors camped deep in their own half, Atletico were able to patiently ping the ball around but were restricted to shots from distance by some stubborn, well-organised defending.
The Arda Turan fizzed an effort narrowly wide and Diego had a fierce strike beaten away by Fraser Forster.
Celtic began the second half in positive fashion, with a 35-yard thunderbolt from Ki producing a good fingertip save from Courtois.
Mulgrew then curled a free kick wide but, just as Celtic appeared to have established a foothold in the game, they fell further behind on 68 minutes.
Turan skipped away from Mark Wilson and got to the bye-line before pulling the ball back for Diego to find the bottom corner of the net with a well-placed first-time strike.
Buoyed by the cushion of second goal, Atletico rediscovered their earlier zip and Turan was denied a goal when Forster did really well to push the Turk's curling shot on to the junction of crossbar and post.
Celtic responded with strikes from Joe Ledley and Kayal, both rising too high to trouble Courtois.
Former Arsenal man Jose Antonio Reyes almost added a late goal for the home side after a burst into the penalty box but Forster got a hand to the substitute's shot and Kelvin Wilson was on hand to hack the ball clear as it rolled towards the goal.
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Live Text Commentary
Full Time The referee blows for the end of the match.90:00 +1:52
Arda Turan takes a shot. Save by Fraser Forster.89:40
The referee blows for offside against Mohamed Bangura. Joao Miranda takes the indirect free kick.87:46
Short corner worked by Jose Antonio Reyes. Cardoso Tiago takes a shot. Save made by Fraser Forster.86:37
Jose Antonio Reyes fires a strike on goal direct from the free kick, Mohamed Bangura gets a block in.86:37 Booking
Booking Booking for Glenn Loovens.86:35
Glenn Loovens gives away a free kick for an unfair challenge on Radamel Falcao.85:44
Short corner worked by Jose Antonio Reyes.85:26
Radamel Falcao takes a shot. Kelvin Wilson gets a block in.83:59
Free kick awarded for a foul by Mohamed Bangura on Joao Miranda. Thibaut Courtois takes the direct free kick.83:10 Substitution
Substitution Cardoso Tiago is brought on as a substitute for Ribas Diego.82:20
Short corner taken by Ribas Diego.82:20 Substitution
Substitution James Forrest goes off and Kris Commons comes on.81:59
Lopez Adrian takes a shot. Blocked by Kelvin Wilson.79:30 Substitution
Substitution Mark Wilson goes off and Adam Matthews comes on.78:44
Shot from just outside the box by Beram Kayal goes over the target.77:36 Substitution
Substitution Joe Ledley leaves the field to be replaced by Mohamed Bangura.77:18
Shot by Joe Ledley from just outside the area goes over the net.76:51
Outswinging corner taken left-footed by Charlie Mulgrew, save by Thibaut Courtois.75:10
Guerrero Antonio Lopez delivers the ball, Shot from 18 yards from Arda Turan. Save by Fraser Forster. Corner taken short by Ribas Diego.
Foul by Mata Mario Suarez on Sung-Yeung Ki, free kick awarded. Joe Ledley restarts play with the free kick.73:05
Diego Godin takes the free kick.73:05 Booking
Booking The referee shows Beram Kayal a yellow card.73:02
Free kick awarded for a foul by Beram Kayal on Diego Godin.71:34
The offside flag is raised against Guerrero Antonio Lopez. Free kick taken by Fraser Forster.70:05
Free kick awarded for a foul by Beram Kayal on Mata Mario Suarez. Free kick taken by Mata Mario Suarez.69:23 Substitution
Substitution Lopez Adrian replaces Fernandez Gabi.67:48
Arda Turan provided the assist for the goal.67:48 Goal scored
Goal! - Ribas Diego - Atl Madrid 2 - 0 Celtic Ribas Diego fires in a goal from inside the penalty area to the bottom right corner of the goal. Atletico Madrid 2-0 Celtic.64:34
Free kick awarded for a foul by Arda Turan on Sung-Yeung Ki. Charlie Mulgrew has a direct shot on goal from the free kick.58:42
Strike comes in from Sung-Yeung Ki from the free kick, blocked by Radamel Falcao.58:42 Booking
Booking The referee books Mata Mario Suarez for unsporting behaviour.58:39
Free kick awarded for an unfair challenge on Georgios Samaras by Mata Mario Suarez.55:38
Direct free kick taken by Fraser Forster.55:38 Substitution
Substitution Jose Antonio Reyes replaces Jorge Koke.55:38
Foul by Radamel Falcao on Glenn Loovens, free kick awarded.53:30
Free kick awarded for a foul by Mark Wilson on Arda Turan. Arda Turan restarts play with the free kick. Ribas Diego takes a shot. Save made by Fraser Forster.52:50
Fernandez Gabi concedes a free kick for a foul on Beram Kayal. Sung-Yeung Ki takes the direct free kick.50:38
Free kick taken by Kelvin Wilson.50:38 Booking
Booking Booking for Fernandez Gabi.50:27
Sung-Yeung Ki fouled by Fernandez Gabi, the ref awards a free kick.49:23
Corner taken right-footed by Ribas Diego, Georgios Samaras manages to make a clearance.46:53
Joao Miranda fouled by Georgios Samaras, the ref awards a free kick. Joao Miranda restarts play with the free kick.46:19
Outswinging corner taken right-footed by Sung-Yeung Ki from the right by-line, clearance by Guerrero Antonio Lopez.46:02
Sung-Yeung Ki takes a shot. Save by Thibaut Courtois.45:01
The referee gets the second half started.45:00 +1:03 Half time
Half Time The referee blows for half time.43:41
Free kick awarded for an unfair challenge on Luis Amaranto Perea by Georgios Samaras. Free kick taken by Luis Amaranto Perea.42:59
Charlie Mulgrew fouled by Arda Turan, the ref awards a free kick. Joe Ledley takes the direct free kick.40:44
Unfair challenge on Joe Ledley by Arda Turan results in a free kick. Glenn Loovens takes the free kick.36:31
Guerrero Antonio Lopez concedes a free kick for a foul on James Forrest. Charlie Mulgrew delivers the ball from the free kick left-footed from right wing, save by Thibaut Courtois.35:36
Radamel Falcao produces a left-footed shot from just outside the box that goes wide right of the target.34:14
Luis Amaranto Perea fouled by Georgios Samaras, the ref awards a free kick. Joao Miranda takes the direct free kick.33:51
Shot from 25 yards by da Silva Diego Costa. Save by Fraser Forster.32:21
Free kick awarded for an unfair challenge on Georgios Samaras by Mata Mario Suarez. Sung-Yeung Ki crosses the ball from the free kick right-footed from left channel, Luis Amaranto Perea manages to make a clearance.30:51
Beram Kayal concedes a free kick for a foul on da Silva Diego Costa. Strike comes in from Guerrero Antonio Lopez from the free kick.30:19
Free kick awarded for an unfair challenge on Charlie Mulgrew by Arda Turan. Direct free kick taken by Joe Ledley.29:57
Beram Kayal challenges Arda Turan unfairly and gives away a free kick. Mata Mario Suarez takes the direct free kick.26:42
The official flags Gary Hooper offside. Thibaut Courtois restarts play with the free kick.19:58
Inswinging corner taken right-footed by da Silva Diego Costa, Arda Turan takes a long range shot harmlessly clearing the crossbar.18:49
The offside flag is raised against Arda Turan. Kelvin Wilson takes the indirect free kick.15:24
Shot from long range by Mata Mario Suarez goes wide of the left-hand post.13:25
Da Silva Diego Costa produces a right-footed shot from outside the penalty box and misses right.5:58
Gary Hooper takes a shot. Thibaut Courtois makes a save.2:32
Assist on the goal came from da Silva Diego Costa.2:32 Goal scored
Goal! - Radamel Falcao - Atl Madrid 1 - 0 Celtic Radamel Falcao finds the back of the net with a headed goal from inside the box. Atletico Madrid 1-0 Celtic.2:09
Corner taken by da Silva Diego Costa from the right by-line,0:30
Shot from just outside the box by da Silva Diego Costa goes over the bar.0:00
The match has kicked off.
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