Not pretty. Cross between a hernia and a tear. It won't heal by itself and requires surgery.
I wonder why he hasn't gone in for surgery then? There must still be some prospect that he won't need it in the immediate future in any case otherwise why hang on? In any case from what I have seen of him you can understand why we took a punt on him, he looks a quality player.
Like Dave said, they have Cabaye and Best down with the same thing, and Cabaye just played 90 minutes. Probably not accurate.