Manchester United manager Louis van Gaal has revealed Anthony Martial's consistency has taken him by surprise after the teenager's impressive start to his Premier League career. The striker joined the Red Devils from AS Monaco on the deadline day of the summer transfer window.

Since joining the Old Trafford outfit, Martial has been in impressive form. He scored on his debut against Liverpool in United's 3-0 victory over their arch-rivals. So far, he has scored five goals in all competitions, which includes an equaliser in the 1-1 draw against CSKA Moscow in the Champions League.

"I'm not surprised by him, no, because we have analysed him and bought him because of our analysis. In the consistency, he has surprised me, but in terms of his ability, no. Because we have known already for a long time he can do it," Van Gaal said, as quoted by the Mirror.

"He has to adapt to our philosophy. That is a big point. He is adapting quickly, but he has to adapt and develop himself more. He is going great though."

"Young players are not normally consistent - they're still looking for their identity in football. That's why I have asked for time for him. But I have said that Anthony is rather good and consistent, even though he is still looking for his own identity at this level of football."

United face local rivals Manchester City in the derby clash at Old Trafford on 25 October. Van Gaal will be hoping that Martial can continue his form against Manuel Pellegrini's side on Sunday.

Morgan Schneiderlin has backed Martial to continue his goal scoring form at United. The France international midfielder believes a victory over City will be important as they are playing in front of their home fans.

"It won't say everything about how the rest of the season will go, but it will make a mark if we can beat City and possibly get back to first place," the former Southampton midfielder explained.

"For us, it's very important to do that - especially in front of our own fans. But, whatever happens, it won't be the end. We still need to work hard because it's a long season."