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Louis van Gaal revealed he has never seen the Manchester United dressing room as happy as it was following Thursday night's Europa League win over Midtjylland.

United's 5-1 thrashing of the Danish champions marked the first time they had recorded five goals at home since December 2011 on a night teenage debutant Marcus Rashford settled the tie.

Two successive victories in the cup competitions have restored the feel-good factor around the club and Van Gaal elaborated on just how upbeat the players were in the dressing room.

"I have seen the dressing room never like this," Van Gaal said.

"Not only the players who have played, but also on the bench, the players who are injured, they were all there and they were all laughing and talking with each other and were happy, that's a long time ago [since that happened], I think.

"So, normally, I expect it gives a lot of confidence but we have to play against one of the best teams in the Premier League. I have said that already a lot of times.

"It's a challenge on Sunday and more than a challenge and we have to play within two days, that's also different but I think the recovery shall go better than ever."

Van Gaal added he was uncertain if Anthony Martial would be fit for Arsenal's visit but was pleased with Marcos Rojo's comeback after three months out with a dislocated shoulder.

"I don't know, because it has happened before the match," he admitted.

"I have talked with him, I have talked with the physiotherapist, who already had control of him, and I cannot say that but it is not as heavy as everybody thinks, but you never know.

"I am very happy with Rojo that he played 10 or 15 minutes and how he already showed his former shape, he was very good, I think.

"But I have to build him up in the games and that's not so easy because he only had two training sessions with me, the first day with the second team and then with us, so I also take a risk to do that but I have to do that now and I hope we can build him up.

"Valencia is coming back and Fellaini is coming back, and in the month of March a lot of players are coming back and then we have a strong selection again, and therefore this match is very important, I think, for a lot of players."