Arsenal manager Arsene Wenger has admitted that he was impressed by Manchester United youngster Marcus Rashford after he scored twice on his senior debut.

The 18-year-old was called on shortly before kickoff in United's crucial Europa League last-32 second leg against FC Midtjylland on Thursday because Anthony Martial pulled up with a hamstring injury in the warm-up at Old Trafford.

It was a nervy start to the game as the Danish side took a 1-0 lead, but Rashford's brace contributed to a 5-1 victory for United on the night.

The youngster could start against Arsenal on Sunday should Martial be ruled out of the showdown at Old Trafford.

"I watched [Rashford] last night and he was quite impressive," Wenger said in Friday's press conference. "Rashford I didn't know but all the other players I knew. For us it's quite simple to prepare. We need to prepare on our side for a strong performance."

Arsenal currently sit third in the Premier League table, 10 points above fifth-placed Manchester United.