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 Zannetti I sent to the SBC area. In short, I want to add my Zannetti card from the SBC area to my active squad. How can I do this?
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.
