Manchester United are 'reluctant to let Dean Henderson join Nottingham Forest, over fears he could re-injure himself during a rigorous medical'.
Henderson, who was on loan at Steve Cooper's side last season when he tore his thigh muscle, is still yet to recover from the setback.
Forest want to secure him on a permanent deal from United, but the Old Trafford club are worried a strenuous medical could see the deal collapse if he aggravates the injury and fails the tests, according to the Sun.
The injury was so severe that Henderson had to go under the knife in May and is on the comeback trail now, able to take part in light training.