Mourinho tells Martial to prove his worth

Mourinho has advised Martial to follow the example of United team-mate Marcus Rashford, who battled back from a run of inconsistent performances to score a crucial goal in last weekend's 2-0 victory against the Premier League leaders.

The United manager, preparing for the second leg of the Europa League tie with Anderlecht, also admits he is uncertain what role Wayne Rooney will play as he struggles to overcome injuries.

But the status of Martial is of particular interest, as United must pay his former club Monaco a further £8.5 million ($10.8 million, 10 million euros) the next time the France international scores a goal for United.

Martial, 21, cost United £35 million in 2015, with the fee to rise to a potential £56 million based on incentive clauses.

The latest kicks in when he scores his 25th goal for the club, a mark of which he is currently one short.

But, despite flashes of brilliance, Martial has yet to hit consistent form and Mourinho is clearly losing patience, leaving him out of his squad altogether on Sunday.

"I know we are together for almost 10 months now. The same way I know the players much better now and the players should know me also much better now," Mourinho told reporters on Wednesday.

"That's why Marcus Rashford, even without being since September with a goal in the Premier League, even without that, he was always a player that I trust, always a player that I play, always a player that I support.

"Because he was always coming in my direction, in the direction I want from a player, what I want as a Manchester United player.

"He's about that. It's about getting to know each other better and better and better and going in the direction of things we like.

"Do I think Anthony is a player with great potential? Yes I think. Do I think he can play successfully for me? Yes I think. But he needs to give me things that I like very much."