If Trossard believes he's good enough for a big club then obviously he'd have fancied his chances of playing a lot for us over the next few months, and then he could have got his move in the summer, when most transfers happen.The difference is about 6 years of age and realising your last chance at a big deal is probably in the next 3 weeks. It’s very easy to do what Mac has done in his situation - particularly having just signed a new contract - it’s not the same for Trossard.
If he doesn’t go this month now he’s unlikely to get much football with us before the end of the season which is going to hurt his value even more.