UFC welterweight contender Georges St. Pierre pulled his groin on August 3, and now his rematch with champion Matt Hughes on September 23 is in jeopardy, according to Sherdog.com.

This is terrible news, considering that this is supposed to be the fight of the year. Most fans, in fact, have all been looking forward to it for months.

Now, we may not see it until next year ... if at all.

St. Pierre and has been taking it easy in the gym, because his doctor initially told St. Pierre he'd need four weeks to fully recover.

That's not the kind of news you want to hear right before the biggest fight of your career.

Patry, St. Pierre's manager, says that Georges is 95 percent and has continued to work on his cardio and boxing during the down period. The injury, however, has made grappling difficult, which is problematic considering it is Hughes' strength.

We'll know more once St. Pierre pushes himself hard during a training session scheduled for August 23.

If St. Pierre can't fight, the UFC has a back-up plan that could include a rematch between Hughes and B.J. Penn.