Arsenal midfielder Mikel Arteta says there is no time to feel sorry for themselves over their defeat at AC Milan.
Arsenal travel to Sunderland for a vital FA Cup tie on Saturday before hosting north London rivals Tottenham the following weekend.
"We have to be mentally ready when we get back because it will be a very tough game against Sunderland. It is very, very hard to take this one.
"We need to be positive, take the bad things we have done tonight and improve them. We were expecting a different game but we found it very difficult to create chances on the floor like we wanted to and they were the better team.
"Every time they managed to get the ball out from the back on the floor and create a problem for us. We are very disappointed, it's a big result to take.""We have to try to digest this result," he told Arsenal Player. "We have another great game on Saturday in the FA Cup and there are some big ones coming up soon.