Upgrading guy

@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
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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.

@TheScholarAM Thank you, you were right I checked only the line up fpr Surge/ Storm and not the other lineups for Turkoglu's upgrade. I'm glad to have your advice to resolve this game features event.

Thanks again I'll click the +xp on your answer.

@WifiMed It is my pleasure that I was helpful, thanks for the upvote!