Perpignan fly-half James Hook will be out of action for between two and three weeks after suffering a chest injury, the club announced on Tuesday.
The Welshman came off during the first half of the Catalan's 46-13 Top 14 defeat to Toulon on Sunday and underwent tests on Monday.
Perpignan's next match is at home to Bordeaux-Begles on Saturday, followed by matches against Bizkaia Gernika RT and Rovigo in the Amlin Challenge Cup. Currently they are eighth in the Top 14 and second behind Worcester Warriors in their Challenge Cup pool.