Solved
SBC Area player stuck.
I bought Zannetti, a 93-year-old right back. But when I opened the package, I found an untradeable version. I sent it to the SBC area. I want to sell the tradable Zannetti in my squad and use the Zan...
Try selecting Send to Club option from SBC storage and not from SBC squad.
Other reason could be that, you still have a player in your club. Make sure you place/list tradable version on trasfer market.
