@WifiMed Firstly, welcome to this expansive community of NBALM players who vow to help other players and bring about great discussions. You can also be an active member of this community,and indulge in great discussions
Here:
https://answers.ea.com/t5/General-Discussion/bd-p/nba-mobile-general-discussion-enReport technical issues,
Here:
https://answers.ea.com/t5/Technical-Issues/bd-p/nba-mobile-technical-issues-enReport bugs,
Here:
https://answers.ea.com/t5/Bug-Reports/bd-p/nba-mobile-bug-reports-enYou can also help other players to the best of your knowledge, would love to have you here on the community.
So as to the answer of your question, to upgrade a Player, you need him out of the team(not on the starting 5 nor the bench)
Specifically, on ANY lineup. I see you're a relatively new player with 95 ovr ultimate, so you might have used that 91 Turgoklu in some other lineup(street, untimate, or muti year) you need that card out of every team, and it will be available for upgrades,
See if it helps and get back to us.