Genuine question... Why?
To date he's shown nothing whatsoever worth being devastated over if he left.
He's a good prospect that is yet to prove anything. Nothing more, nothing less.
Spurs & Arsenal thought to be interested like, think it's quite clear he has potential and PACE which were absolutely crying out for. Joke of a decision if he leaves.
What annoys me about koeman is he has one quiet game and is thrown out of the team for weeks, Williams/gana/schneiderlin/martina can play how they like and be played constantly