Chido Obi is laughing at Arsenal and Mikel Arteta after sensational Manchester United transfer

Manchester United welcome Arsenal to Old Trafford in the Premier League on Sunday.

United drew 1-1 with Real Sociedad in the Europa League on Thursday night, but they returned to Manchester ultimately feeling disappointed they didn't win the game in San Sebastian.

Ruben Amorim's side have often reserve their best performances for fixtures away from home during his tenure and they must deliver a strong display against Arsenal this weekend.

Arsenal head into this clash after an emphatic 7-1 victory over PSV in the Champions League and they are looking to win five successive games against United in the Premier League.

So here are five things to look for at Old Trafford...

Chido Obi wasn't involved in the FA Youth Cup quarter-final against Arsenal last weekend, but he might get the chance to play his former club in the Premier League on Sunday afternoon.

"THANK YOU SO MUCH," commented Obi under a picture of a teammate after the Under-18s knocked out Arsenal of the prestigious academy competition, which suggested there is no love lost between Obi and the Gunners.

Obi will relish the prospect of scoring against Arsenal at Old Trafford, although it would be a surprise to see Amorim include the youngster in the starting team, despite having eyes on the second leg against Real Sociedad in the Europa League.

Nonetheless, Obi could get another opportunity to show what he can do from the bench and he would love nothing more than to score against the club who he chose to leave last summer.

Amorim's squad has been depleted by injuries and, speaking after the Sociedad game, he said United would have to physically "survive" against Arsenal to make it unscathed to next week.

Toby Collyer was introduced in the final mates in Spain and