I can't sell my tradeble player

I bought a 124 OVR Gusto from the Transfer Market approximately 3 weeks ago. The player is still marked Tradable, has never been activated in Badges, and is not in any squad. However, the SELL button is greyed out and I cannot list him. I have restarted the game and checked my squads. Please check the card/account and restore the ability to sell him  and he is not in any of my squads or benches . What do I do