Nearly put his team in trouble with a dodgy clearance. Made an important save from a tricky Xavi free-kick. No chance with the goal. Kept it at one with a fantastic double save late on, and then again when denying Neymar once more.
Helped out at the back and used his pace to counter, though he lacked a final ball and lost possession too easily a few times.
Solid at the back but, mostly fairly understandably, failed to get forward.
Read Barcelona's attacks well and made a number of important interceptions. Perhaps could have done more with the ball.
Obviously found it tough against Barcelona but didn't keep the ball well enough. Should have scored with a good chance minutes before his side conceded.
Dealt with Neymar pretty well. Got forward well at times, though he wasted one good chance on the break with a poor pass. Withdrawn with 20 minutes left.
V. van Dijk
Made a good early tackle on Iniesta and won numerous headers & personal duels.
Saw an early shot blocked, and whipped in one dangerous cross, but otherwise had little chance to attack. Brought off late on.
A handful early on as he showed good movement to create a chance. His influence faded, though, as he became more and more isolated and he failed to hold the ball up well enough. Put a shift in defensively when they went down to 10 men.
Nice early touch to create Samaras a chance but might have done better to help support the striker more quickly at times. Brought off with 20 minutes left.
Saved well from Samaras early on, and then from Forrest later in the game. Flapped at a couple of balls into the box, including on one occasion where Mulgrew should have scored.
Part of a defence that looked a bit shaky early on, but had little to do for the remainder of the match. Fired one decent effort at goal.
Despite having little to do at the back didn't make enough of an impression going forward. Created one good Neymar chance, though.
Made a few wayward passes from the back and failed to get things going quick enough at times. Rarely worried defensively.
Got himself into one great position down the left but didn't do it nearly enough. Saw a late effort saved brilliantly by Forster.
Pulled most of Barcelona's strings in midfield but certainly wasn't as creative as he can be. Brought off late on.
Made a couple of uncharacteristic passing errors. Tested Forster with a decent free-kick.
Popped up in some good positions but didn't cause much of a threat to Celtic's defence. Found the corner with a brilliant header to open the scoring.
Didn't move the ball as slickly or quickly as normal, but made a couple of tackles to break up Celtic's counter-attacks.
Nice ball to play in Adriano and went close himself with a neat flicked effort but, overall, not enough final product. Used his pace to get in behind Brown and force the foul that led to his red card. Twice denied by Forster late on.
Was pretty ineffective as part of a Barcelona attack that lacked creativity.