Arsenal defender Hector Bellerin says the Gunners must bounce back from their defeat to Chelsea on Sunday.
The hosts were reduced to 10 men after Per Mertesacker was sent off in the 18th minute for bringing down Diego Costa - who scored the only goal in the game six minutes later.
The defeat at the Emirates sent Arsenal down to third position on the Premier League table and after the tie Bellerin said 'we need to keep our heads up and move onto the next game'.
He told Arsenal.com: "It is difficult because [even though we were] playing with 10 men we thought in the second half that we wouldn’t give up, and we had some chances to get a better score.
"It couldn’t be done and it was a bit unlucky on our part. We need to keep our heads up and move onto the next game."
On the red card, the full-back said: "It is a difficult one as a player and it is a bit hard for us. It was far from goal but if the referee makes that decision he has to be right.
"There is no excuse and [it is difficult] with 10 men but we tried our best."
Regarding the Premier League title, he added: "We always think of it. We take it game by game and when it comes to May we will see where we are."