Manchester United striker Wayne Rooney has lauded the impact of teammate Anthony Martial since his arrival at Old Trafford.

The Red Devils made the 19-year-old the most expensive teenager in football history when they signed him from Monaco for £36million this summer.

Martial has wasted no time endearing himself to the United faithful, with five goals in his first 10 appearances for the Premier League club.

Rooney said he has been impressed with how quickly Martial has adapted to life in England's top flight.

"I think he has been incredible, how he has come over to Manchester and started the way he has," Rooney told United Review.

"Let's not forget he is still a very young lad as well. To come over with his young family and start the way he has, he deserves a lot of credit.

"You can see what a good player he is and he'll be an important player for us from now until the end of the season. He is probably the quickest player in our team, if not the quickest in the league."