Eintracht Frankfurt sports director Markus Krösche admits Omar Marmoush could be on the move in January.
The Egypt striker is being linked with a move to England, where Nottingham Forest are keen.
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"It's true that Omar made a clear commitment to us in the summer," Krosche told fussball.news, "he has developed well and still has a lot of potential to develop further.
"For us, we don't want to lose so many key players."
But then he added: "I have to honestly say that no Eintracht player is unsellable..."