Arsenal manager Unai Emery says his side are wary of a "very dangerous" Manchester United side.

The two rivals will meet in the FA Cup fourth-round at the Emirates on Saturday.

"It's a different team," he said. "It's the same players but they're playing with a big performance now. I was watching their last matches and each player has a lot of confidence, with big performances, and now they are very dangerous.

"For us, it's good because it's a very big test for us in this competition. Manchester United and us have played 20 finals in the FA Cup, and we've won 13 and they've won 12. For this competition, it's the best match to play.

"We are looking forward to playing this match on Friday because it's at our stadium, the Emirates, in front of our supporters. We feel very well in front of them and we want to create a new atmosphere over 90 minutes on Friday, together with our supporters."