The two youngsters have often had to battle it out for the same starting XI spot out on the left wing this season.
Romelu Lukaku’s transfer to United has seen both players rarely feature in their preferred positions and role as strikers.
With just one spot available to the pair, Rashford and Martial have rotated with each other and shared the position to great effect.
Marcus has normally started matches for the most part but Anthony’s good form off of the bench resulted in both players starting vs Newcastle but Mourinho explained why it’s tough to keep doing so.
According to the Independent, Jose said: “They both like to play in the same position and that is difficult. They both prefer to play on the left than the right, both playing with another striker through the middle, we lose a point of contact with the midfield that we are used to, with the player playing behind the striker.
“But we found then a certain balance and when they start finding, sometimes both, one opening the left and one on the mid-left between the striker and the left winger, it was the moment where we start creating more.
“But to be honest Newcastle was probably the team, not in the second-half, but in the first-half which come here and we felt a bit of instability in our defensive areas, and that was clearly not because of the defensive players but because of our balance.
“So to play them [Martial and Rashford] together gives us things but also takes some things from us.”
Newcastle United managed to open the scoring against Manchester United during their clash at Old Trafford on Saturday but the Red Devils roared back to a 4-1 win.
Rashford was also involved in the goals, assisting Pogba with a beautifully precise header to find his teammate in open space.
Martial’s goal was also scored with his head after a delightful cross from Paul that helped equalise the game and spark Old Trafford into life.
Jose Mourinho will be delighted to have two hungry youngsters battling it out for first team football but United fans will be a little unhappy to hear that the pair are unlikely to feature together too often in the future.