Rool ruled out
By Patrick Haond
Last Updated: 01/01/70 1:00am
The Lens defender fell awkwardly during the match with Nice earlier this month and dislocated his shoulder.
The 28-year-old received treatment on the injury but suffered a relapse on Tuesday.
An operation can now not be avoided and Rool is due to go under the knife in Lyon.
It will take the Sang et Or full back around three months to recover and it is a blow to coach Joel Muller.
The Lens boss is still waiting for John Utaka (Nigeria) and Adama Coulibaly (Mali) to return from the African Cup of Nations.