Glasner said with Afcon that both Sarr and Uche could miss 8 games.
That's a big chunk of games and I'm not sure Uche will start a game before Afcon.
This would mean he'd have to start 10 games between January and the end of the season to trigger the obligation to buy ( if the stories of such arrangement are correct).
At most at present he's getting a few mins and is a last resource substitute.
Things can change quickly , but not if he's getting little time on the field and if out of position players are preferred as substitutions when they are made.