Lookman was really rumoured with Galatasaray and Fenerbahçe on the recent days. But they both went for a really late move and it was the deadline for European tournaments registration.
The transfer window was also about to close for Serie A teams so that must be why Atalanta wasn't also keen on letting him go. They wouldn't have been able to find a replacement while there were only hours left...
Staying at Atalanta is still not good for him in the long term though. I don't believe in Juric at all.
I would say that Ademola Lookman has literally been unlucky with the transfer window this summer because first he was linked to Inter Milan, then Spurs, Bayern Munich, Arsenal and no one was successful. Staying at Atalanta is the only option at this moment and I doubt if he will be happy playing for the club for the rest of the period.
One thing clubs fail to consider is the happy state of a player playing for them. If you forcefully keep a player that wants to move to a different club, it will affect him emotionally and that will also affect his performance in the matches he will be playing. Atalanta should have let go of him rather than keeping him to themselves. Some players were allowed to leave the club why is Lookman own different.