Hull City boss Steve Bruce has spoken of Charlie Austin's failed medical with them two years ago.
Austin was with Burnley at the time and eventually moved to QPR.
"Going back 30 years, I failed my medical with a knee injury I didn't know I had, at Manchester United," said Bruce.
"They signed me on my playing record and the belief that I'd never had a bad knee.
"It went back to something when I was a kid, at the age of 12. Incredible. The sad thing (for Austin) is he probably never knew he had a funny knee, or something wrong with his knee."
