SUBSTITUTIONpublished at 75 mins
Arsenal 1-2 Vitoria Guimaraes
That's Alexandre Lacazette's last action. He's replaced by Nicolas Pepe.
Pepe scores two free-kicks to save Arsenal
Martinelli heads equaliser but visitors retook lead five minutes later
Former Tottenham player Marcus Edwards scored opener for Portuguese
Partizan Belgrade 0-1 Manchester United and Slovan Bratislava 1-2 Wolves
Rangers draw with Porto, Celtic lead Lazio
Emlyn Begley
Arsenal 1-2 Vitoria Guimaraes
That's Alexandre Lacazette's last action. He's replaced by Nicolas Pepe.
Arsenal 1-2 Vitoria Guimaraes
Alexandre Lacazette gets booked for moaning at the referee about not getting a free-kick.
Arsenal 1-2 Vitoria Guimaraes
Free-kick to Arsenal on the right wing, Dani Ceballos to take...
and it's over everyone.
Arsenal 1-2 Vitoria Guimaraes
Nicolas Pepe is getting ready.
Arsenal 1-2 Vitoria Guimaraes
A quick Arsenal break and Gabriel Martinelli tries to pick out Alexandre Lacazette, with a defender putting it behind for a corner.
From the corner Lacazette tries to curl into the top corner but gets it wrong.
Arsenal 1-2 Vitoria Guimaraes
Vitoria bring off English goalscorer Marcus Edwards. Andre Pereira, who is on loan from FC Porto, comes on.
Arsenal 1-2 Vitoria Guimaraes
A great dribble by Marcus Edwards down the right but he gets his final ball wrong towards Denis Poha.
I've been very impressed by Vitoria's attacking players. Some real talent on show.
Celtic are level against Lazio thanks to Ryan Christie.
Arsenal 1-2 Vitoria Guimaraes
Alexandre Lacazette almost gets onto a through ball, but Vitoria hook it out for a corner.
#bbcfootball or text 81111
Alistair Wiseman: let's hope their Pepe is as good as ours.. Arsenal may stand a chance against 10 men!
Arsenal 1-2 Vitoria Guimaraes
Pepe is coming on... but not Arsenal's Nicolas.
It's Vitoria holding midfielder Pepe, who replaces Andre Almeida.
Arsenal 1-2 Vitoria Guimaraes
Vitoria's Marcus Edwards is involved for the first time in a while. He pulls it back to Andre Almeida, whose shot hits Rob Holding and goes out for a corner.
Arsenal get the corner away.
Arsenal 1-2 Vitoria Guimaraes
Denis Poha takes one for the team as he brings down Matteo Guendouzi. Yellow card for the Vitoria midfielder.
Arsenal 1-2 Vitoria Guimaraes
Poor from Alexandre Lacazette.
Victor Garcia probably fouls him on the edge of the box. Lacazette isn't happy, they have an argument and Garcia nudges him in the chest. Lacazette goes down holding his face.
Disappointing from the Arsenal striker.
Garcia is booked.
Arsenal 1-2 Vitoria Guimaraes
Corner to Vitoria now, which curls just wide of the far post. Emiliano Martinez flapped at that, for a second is looked like it could fly straight in.
#bbcfootball or text 81111
Mike Edwards: Let’s give Bruce Rioch a call see if he fancies another try
Arsenal 1-2 Vitoria Guimaraes
More good play by Kieran Tierney down the left for Arsenal. His cross bounces around the box and eventually lands to Emile Smith Rowe. The Gunners youngster should do better as the ball drops to him but he blasts the shot well wide.
Arsenal 1-2 Vitoria Guimaraes
Arsenal have only had the one shot on target. Vitoria have had five.
Arsenal 1-2 Vitoria Guimaraes
Another Vitoria chance, this time Davidson's header is straight at the Gunners keeper.
Arsenal 1-2 Vitoria Guimaraes
Vitoria have a chance to score a third. It's good wing play by Davidson and he crosses for Denis Poha, whose flicked shot is saved by Emiliano Martinez.
This has been a pretty good game for the neutral.