This happened to me also, with another player and another team. I am sure that it is not purely coincidence, it may have something to do with his stats. High aggression for example.
In my Millwall Story, i signed Craig Bellamy, he injured some one, although it wasn't too serious but then he broke my Goalkeepers leg! I had to sign a new keeper, and totally screw up my finances. So i just terminated his contract, **** Bellamy