Crewe will allow midfielder Eugen Bopp to leave if he can find a new club. Bopp joined the Alex on a free transfer from Rotherham in the summer but has found it hard to get a regular place in the first team.
The 24-year-old has only made three league starts this season for Dario Gradi's side.
Bopp was born in Kiev but came through the youth ranks at German side Bayern Munich before joining Nottingham Forest and then the Millers.
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