Arsenal defeated Watford 1-0 in Monday Night Premier League clash courtesy of Pierre Emerick Aubameyang’s lone goal.
Ben Forster’s error allowed Arsenal to take the lead in the 10th minute when he took too long to clear a pass which deflected off Aubameyang to sail into the net.
Troy Deeney was sent off for raising his forearm in the face of Torreira.
Watford continued to cause problems for Arsenal with a man down, they were even unlucky.
Arsenal have moved back to the fourth position with the victory as they aim to earn a champions league place.
Arsenal kept their first clean sheet in an away game this season.
Arsenal manager Unai Emery says it is important to get the maximum points with a clean sheet.
“We were competitive today but in the circumstances we can control the match better. We didn’t make it easy to score the second goal.
We did not control the ball in the attacking third.
“A clean sheet is very important. It is going to give us a lot of information, this match. Our analysis will give us confidence.
“For some players like Konstantinos Mavropanos it is good, to play some minutes and give other players some rest for Thursday.
It is a different competition; we have a two-goal advantage against Napoli but it is going to be very difficult.