I'm afraid I don't know the answer to this. Rather amusingly, his dad doesn't particularly like football and I've not been instrusive enough to ask directly. I think I (we) would have heard about it if it had gone to tribunal, though. Most likely another 'undisclosed fee' that TB is so fond of.
I work with Toby's dad, who will be a very proud father this evening. Toby would have made his Man United debut some time ago, but he had a serious injury last season which ruled him out for months.