Only transfer news about Omur in Turkey was a local newspaper from Trabzon - https://www.61saat.com/abdulkadir-omur-ingilterede-aradigini-bulamadi, stating that he was out of squad for last 5 games and Samsunspor, Besiktas, Goztepe interested in him.In terms of the 25-man squad, with the window closed we have 27 overage players on our books. We will have to leave at least two out but there are several possible candidates. Belloumi and Millar are obviously unlikely to be able to play any part this season, likewise Zambrano. But I don't know that any of those are absolutely certain, so maybe there's a chance we name them. Sinik has never been worth a place and he and Ömür sound like they might still be off before the Turkish window closes in a couple of weeks, but if we're not certain about that then we probably need to name Ömür in the squad because he's too good to have sat rotting in the U21s because of a move falling through. Fleming is another one who seems to have no chance of playing. Cartwright wasn't named in the squad in the first half of the season but as he's now 3rd choice keeper instead of 5th I think he'll need to be named.
It is a bit absurd, because Samsunspor is suspended, they can't complete transfers as you can see with 0 transfers in Transfermarkt this year. Goztepe is managed by same group of Southampton, so they usually go for scouting transfers or prospects that might be linked to their other clubs at some point, so Omur doesn't fit. And Besiktas has just brought Solskjaer as manager after they decided season is already lost, and they are allegedly targeting young potentials to catch up Gala and Fener in next couple of years, but there are couple of resources stating Besiktas interest.
