SUBSTITUTIONpublished at 42 mina
Valencia 0-0 Barcelona
A slim chance for Kluivert is snuffed out by a superb tackle on the edge of the box by Kounde.
Alonso is on for Eric Garcia, maybe a groin problem.
Valencia 0-1 Barcelona - Robert Lewandowski scores injury-time winner
Barcelona return to the top of La Liga with the win - Real Madrid drop to second but face Girona on Sunday (15:15 GMT)
Xavi's went into the game after being dumped out of the Champions League at the group stage in midweek for the second year in a row
Valencia remain 10th after the defeat and are without a win in three in the league
Tim Oscroft
Valencia 0-0 Barcelona
A slim chance for Kluivert is snuffed out by a superb tackle on the edge of the box by Kounde.
Alonso is on for Eric Garcia, maybe a groin problem.
Valencia 0-0 Barcelona
Hmmm, Marcos Alonso is coming on. Tactical or an injury?
Valencia 0-0 Barcelona
It's a cacophony in the stadium as the Valencia fans feel aggrieved at not getting a handball, but their side are second best at the moment.
Ter Stegen has had nothing to worry about, but Barca have not been clinical in the Valencia box.
Valencia 0-0 Barcelona
A sniff of a chance for Fati, as Dembele slaloms down the right to send over a cross that his team-mate cannot get on top of - the header loops well wide.
Valencia 0-0 Barcelona
De Jong takes aim from outside the box, but his left-footed shot fades away wide of the target.
Valencia 0-0 Barcelona
Barca's main threat at the moment is through Fati, while there's been almost nothing from Los Che.
Valencia 0-0 Barcelona
Fati rolls it home after he's found in the area by Lewandowski, but he's a shade in front of the defender and the goal does not stand.
The last touch came off Gabriel, but Fati may be have been offside when Lewandowski touched it - it's far from clear.
Valencia 0-0 Barcelona
Eric is booked for clumsily catching Marcos Andre.
Valencia 0-0 Barcelona
Gaya curls over a cross deep into the box towards Cavani, but it is cut out by Ter Stegen.
Cavani is clearly struggling and he's off, limping off to be replaced by Marcos Andre.
Valencia 0-0 Barcelona
First good chance for Barca!
Fati gets in between two defenders and tries to lift the ball over the onrushing Mamardashvili - who makes a save with his face. That's gotta hurt.
Valencia 0-0 Barcelona
Cavani is off the pitch for a minute, leaving Valencia down to 10 men until he gets some running repairs to a boot finished off.
There's been very little to show from the hosts so far, but Barca are yet to get a shot on target.
Valencia 0-0 Barcelona
Barcelona in control, with Dembele cruising forward to the edge of the box until a Valencia leg intercepts.
Valencia 0-0 Barcelona
Mamardashvili loses possession in his own area and De Jong fluffs a chance to shoot, the ball sliding off to Fati but he can't get a shot away cleanly and the danger passes.
Valencia 0-0 Barcelona
The hosts get the match under way!
There's a nice tribute to David Villa just ahead of kick-off, with huge applause all around the Mestalla.
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Valencia v Barcelona
While being dumped out of the Champions League prompted headlines like "Night of terror", Barcelona's La Liga form has prompted fewer nightmares given their second place behind arch-rivals Real Madrid.
Valencia, meanwhile, are without a win in three and lie 11th.