He was included in Roy Hodgson’s Euro 2016 squad despite only making 18 appearances for Man United last season and surprised fans with his sensational arrival.
However, with the signing of Zlatan Ibrahimovic at Old Trafford, Rashford hasn’t played a single minute in the Premier League under new boss Mourinho.
Speaking about Rashford’s position, Allardyce insists it’s harder for him to be selected as he isn’t currently playing.
“The difficulty is Rashford’s not playing,” he said.
“It makes it harder for me to select him, as exciting as he was last year, bursting onto the scene.
“I could say ‘go and play for the Under 21s’ get used to international football there and that will help you eventually break into the Manchester United team and eventually the England team. I’ve got all those scenarios to consider.”
News that he could demoted to the Under 21s will come as a shock after his brilliant showing in France, where he scored three minutes into his senior debut for England.
Ibrahimovic’s arrival will help take the goal scoring burden off Rashford’s shoulders and provide him with the opportunity to learn from one of the best strikers in the world.
The Swede’s career at Old Trafford isn’t expected to be a long-term deal and when he decides to retire, all hopes will be on Rashford, who will have hopefully developed into a consistent striker the club can rely on each week.