On his knee injury, apparently
If he comes, I’ll give him a chance before dismissing him.Wilson did not feature for Manchester United's senior team in the 2017–18 season, as he continued to recover from the serious knee injury that he had suffered on loan to Derby.[20] He did, however, feature prominently for the Under-23 side before his loan move to Sheffield United, departing as the side's top goalscorer mid-way through the season.[21]
Seems like Sunderland are interested too.