Manchester United attacker Marcus Rashford says he and Anthony Martial are pushing eachother to continue to improve.
Picking between the pair has becoming an increasingly difficult task for Mourinho, but a situation he will be pleased to be in.
Speaking about his friendly rivalry with Martial, Rashford said: "It's difficult when you're in and out of the team, but we have to find the positives out of it and I think we have both done that.
"I think the competition is always positive competition because we're improving each other every day when we're in training and in the games we're pushing each other more and more.
"It's a bit of a headache for the manager but it is a good headache to have."