Match ends, Celtic 5, FC Astana 0.
Celtic all but booked their Champions League group stage berth by thumping Kazakh champions Astana in the play-off first leg.
Tom Rogic created the opener when he drove into the box and lifted a ball into the area that Evgeni Postnikov could only divert into his own net.
Sinclair raced clear to add the second and doubled his tally after the break.
James Forrest fired the fourth before Leigh Griffiths' shot deflected in off Igor Shitov for number five.
The sides meet again on Tuesday in Kazakhstan for the second leg, which now looks a formality for the Scottish champions, who knocked Astana out of the competition in the third qualifying round last term.
Fortune favoured Celtic at critical moments in this one, but it was a measure of the ruthless instincts of Brendan Rodgers' side that they took full advantage.
Astana set up to try to thwart the home side, who found it tough to pass through a packed midfield and defence in the opening stages.
Forrest and Kieran Tierney - playing very high and wide to try to stretch the game and allow Sinclair to play infield and closer to Griffiths - provided a couple of dangerous crosses, but Celtic needed to be patient.
They were rewarded when Rogic, who was casually effective, showed quick feet to carry the ball past two defenders and into the penalty area. He clipped it across goal, where Astana centre-back Postnikov lunged to clear but fired the ball into the empty net.
The goal bolstered Celtic, but they still had to survive a scare when Postnikov powerfully headed Serikzhan Muzhikov's corner wide from a central area.
The home side were not to be swayed, though, and when a tackle deep inside Astana's half inadvertently sent the ball beyond the visitors' defence, Sinclair ran through from an offside position and expertly steered the ball beyond goalkeeper Aleksandr Mokin.
Astana had been disciplined for the opening part of the first half, but Celtic's advantage scrambled their senses after the break. They might have griped that when Rogic and Yuri Logvinenko clashed heads just inside the Astana half play should have stopped. The referee played advantage, since it had been a foul against the Celtic midfielder, and Griffiths combined with Sinclair for the latter to drill home a third goal.
Rogic and Yuri Logvinenko were substituted, with the Astana man having his head bandaged before he was booked and replaced. Celtic were in full command by then.
In the build-up to the game the focus had been on whether or not Griffiths would be fit enough to lead the line and provide Celtic's goal threat. He sliced wide when sent through on goal, but his impact on the first leg was one of creativity. Having played a vital role in Sinclair's second, he set up the fourth goal of the night for Forrest by shrewdly holding on to the ball before playing it into the winger's path.
As with all three earlier strikes, Forrest punished the meek goalkeeping of Mokin, lashing the ball past him and into the far corner.
Griffiths could not be contained and his shot was directed into the net by Shitov to round of the evening's scoring.
Astana have an excellent record at home, but this tie is beyond them now. Celtic showed their cutting edge, but they also have the experience and game management to complete their progress into the group stage of the Champions League.
- 63TierneyBooked at 49mins
- 8BrownBooked at 40mins
- 49ForrestSubstituted forS Armstrongat 82'minutes
- 18RogicSubstituted forMcGregorat 63'minutes
- 14S Armstrong
- 24de Vries
- 4ShitovBooked at 69mins
- 44PostnikovBooked at 6mins
- 27LogvinenkoBooked at 63minsSubstituted forBeysebekovat 66'minutes
- 14TomasovSubstituted forMurtazaevat 77'minutes
- 7MuzhikovSubstituted forGrahovacat 82'minutes
- Ovidiu Hategan
- Shots on Target
Second Half ends, Celtic 5, FC Astana 0.
Corner, Celtic. Conceded by Evgeny Postnikov.
Offside, FC Astana. Ivan Maevski tries a through ball, but Roman Murtazaev is caught offside.
Foul by Olivier Ntcham (Celtic).
László Kleinheisler (FC Astana) wins a free kick in the attacking half.
Foul by Leigh Griffiths (Celtic).
László Kleinheisler (FC Astana) wins a free kick in the defensive half.
Corner, Celtic. Conceded by Evgeny Postnikov.
Attempt saved. Roman Murtazaev (FC Astana) right footed shot from more than 35 yards is saved in the top centre of the goal.
Own Goal by Igor Shitov, FC Astana. Celtic 5, FC Astana 0.
Attempt missed. Leigh Griffiths (Celtic) left footed shot from the right side of the box misses to the left. Assisted by Stuart Armstrong.
Olivier Ntcham (Celtic) wins a free kick on the right wing.
Foul by Srdjan Grahovac (FC Astana).
Substitution, Celtic. Stuart Armstrong replaces James Forrest.
Substitution, FC Astana. Srdjan Grahovac replaces Serikzhan Muzhikov.
Goal! Celtic 4, FC Astana 0. James Forrest (Celtic) right footed shot from a difficult angle on the right to the bottom left corner. Assisted by Leigh Griffiths.
Attempt missed. Dmitriy Shomko (FC Astana) left footed shot from more than 35 yards is high and wide to the left. Assisted by Ivan Maevski.
Substitution, FC Astana. Roman Murtazaev replaces Marin Tomasov.
Scott Sinclair (Celtic) wins a free kick on the left wing.