Manchester United were warned about Luke Shaw's dietary habits by Southampton when first signing him.
The Daily Mail says Saints warned United about Shaw's liking for fast food and fizzy drinks.
He struggled for fitness under Louis van Gaal before suffering his horrific leg break.
And, despite getting back into the team for spells, has largely been on the sidelines under Mourinho.
He has made 12 starts this term and was described as one of the best in the world in his position earlier in the year.