I also find that if you ask for money in installments you tend to recieve more in the long run. got £73M in installments for selling my star regen because i had a cheaper replacement breaking into the team.
You'll never get more than double his value if you offer him out. Only if another club bids when he's not listed, if that makes sense?
Then dont offer to clubs, just place on the transfer list and let clubs come in for them once they perform.