The former Bayern Munich, Notts Forest and Rotherham United midfielder has found it hard to make an impact in the first team this season.
Bopp made 12 apperances this season and netted in the win over Huddersfield Town back in September but injury and some poor performances has left the club management team looking to offload the Kiev born player.
The 24-year-old has been given permission to talk to other clubs and feature in some trials and has already been north of the border and also Kiev.
Holland told the official site ''As we are out of the transfer window, he cannot sign for another club but a club in Scotland and one in Kiev were keen to have a look at him.
''We will sit down with Eugen in the next few weeks and see where we go from here in terms of his long-term future. He has been a superb professional and there are no complaints on that score.''