Liverpool goalkeeper Simon Mignolet says they must not dwell on defeat at Arsenal.
The Reds have an FA Cup replay tie at Blackburn Rovers on Wednesday night.
"We knew that the two games against Manchester United and Arsenal would be very important," the goalkeeper told the Liverpool Echo.
"We needed to take points from them but we haven't and that's a big disappointment.
"We didn't start the game against Arsenal the best but then we got back into it and created a few chances.
"Unfortunately, we didn't take them and then conceded three goals in a really short period of time that killed the game off really.
"In the second half we were playing for pride. We played better and pulled one back but then after we went down to 10 men we conceded again.
"We have to move on. We've got another massive game on Wednesday night. We need to make sure we get through in the FA Cup.
"The FA Cup tie is our only focus now. The FA Cup is very important for us. We have to make sure we are prepared.
"We know what's at stake. We know it won't be an easy game but we need to be ready for Blackburn."