Yeah, I'm going to need some more information - the whole save would probably be the easiest to deal with, because there are a few strange things happening here we'll need to check. Instructions for uploading the save are
here, or you can put it on a file sharing site like dropbox or filedropper.com and send me the link.
And, assuming the save is from after he signed with the new team, I need a little more information about what happened before that - you said he was under contract to a Euro team while also under contract to you? That shouldn't be possible. Which team was it, and where was he actually playing last season? And how exactly did it prevent you from offering a new contract - it wouldn't let you offer it at all, or he broke off negotiations after the initial offer for a renewal?