True, Rashford will not be guaranteed a place in the Tottenham starting lineup rightaway, but he should know that Pochettino improves young players and gives them chances.
Since the arrival of Sanchez from Arsenal, Martial has found himself sidelined while Rashford has only managed five starts in the last 16 games for United.
West Brom, who have Darren Moore in charge after Alan Pardew was sacked, go into the game 10 points from safety but Mourinho says he is "surprised" they find themselves at the foot of the table.
"So I think you are playing not only for yourself and for the club, but for all the people that are living that dream through you".
"I am not a big fan of buying players in the winter market because of the period of adaptation especially with attackers". Football can not be whittled down to catchy headlines; sacrificing genuine insight in favour of shock value deprives us of being able to have a meaningful connection with the sport online. We can not have 11 players - it would be wonderful, also economically for the football clubs - to have only 11 players and play always with the same 11 and no injuries or suspensions or fatigue and nothing, it would be better for everyone but it is not possible.
"It would be better for everyone to have only 11 but is impossible".
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"Only 11 can start so the same questions you are doing to me, you should do to every other manager because everyone has players in the same situation".
Mourinho also confirmed that Rashford is the only player who have made the most appearance since the Portuguese manager arrived at the club.
Mourinho rejected the suggestion he would look to sign an alternative choice to Lukaku within the summertime, whatever the striker missing merely two video video games all season. The dry answer is only 11 can start the match and we have 22.
"If I have more competition for him I have more competition for the other ones you are saying are not happy because they are not playing".
United return to action on Sunday when they welcome West Brom to Old Trafford in the Premier League.
"The quality, the experience of numerous players, the squad, the stability of the past years, it is a surprise for me they find themselves in this position", he said.