The pair grew up in the Academy together and were part of the same year group before both making it into the first team.
Rashford admits he was struggling with injury at times last season and, after appearing for England at Euro 2020, it was decided the best course of action was an operation to solve a shoulder problem.
After missing the start of the 2021/22 campaign, there is a hope he may be available for the game at Leicester City immediately after the international break, and his work at Carrington has already caught the eye of his friend.