Martial, 24, has scored just two goals in 10 games and there are growing calls for veteran forward Edinson Cavani to start ahead of him.
“I was thinking about him [Martial] and there were fans messaging me on social media about him asking what is going on with him and why he isn't producing and scoring goals," Berbatov told Betfair.
"He needs to up his game, not only him but the whole team too. In the really important games he need to shine even more.
“I've been surprised with how well Edinson Cavani has performed, the guy is 33 years old and he's running around the pitch like he's a 25-year-old, fighting for the ball, making spaces, the passion he had is still there and that is something that Martial needs to look at and improve on. He needs to bully defenders and get dirty from time to time.
“He has the other attributes like technique, speed and stamina and other things like that, but in some games, like the one against PSG, you need to be a bit nasty and when you have an opportunity to score, you need to score."
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