He's a big unit who is very quick, he has just had a serious big muscle injury, which followed a broken toe. The problem here may well be that he has been running with an unnatural gait because he was originally playing through the pain with the broken toe. This may well have been the root cause of the thigh injury and his gait may have been further compromised due to trying to protect his thigh.
All this can and often does, happen to runners. It is something which is done unconsciously through a subliminal wish to protect the area of weakness. The only real cure is a total lay off and then a whole reassessment of the running action during rehab. In runners with explosive pace, they may find that they can no longer function at the upper limits of their power. Unfortunately I fear that Dominic may have to rethink his whole playing style.