Quick sell

You can't recover them in game, but you can recovery them via the FC 26 Companion app. Give it a quick google search on how to do it. I think you get 4-5 recoveries every 30 days or so.

Here is the Quick Sell Recovery tool you can use in similar scenarios. 

I have spent days doing the SBC for sesko, my game glitched and some how he was quick sold. I have already used my quick sell for the next 31 days. I have spoken to EA and they said they are unable to recover when I know that they can and that other people have had players recovered for them. Why would I spend loads of players just to quick sell him, your system glitched and sold my player but they will not recover him or reimburse me. Joke!!