Elvis Vermeulen will be sidelined for four months after being diagnosed with a herniated disc.
Exeter Chiefs will face the Heineken Cup champions for the second successive season after they were drawn with Toulon.
Vern Cotter will remain as Clermont boss for next season before taking up his role as Scotland head coach in June 2014.
Vern Cotter has denied reports that he offered to quit as coach of Clermont to manage Scotland earlier than expected.
Clermont hooker Benjamin Kayser has confirmed he will be fit for France's tour of New Zealand this summer.
Clermont head coach Vern Cotter has confirmed that he will leave the Top 14 outfit at the end of next season.
Castres will face Toulon in the Top 14 Final after claiming a shock 25-9 victory over Clermont in in Nantes.
Clermont are looking to bounce back from Heineken Cup defeat as they take on Castres for a place in the Top 14 final.
Delon Armitage admits he was "stupid" to mock Brock James as he scored a try in the Heineken Cup final.
Toulon's Delon Armitage embroiled in row with past and present players after taunting an opponent.
Toulon staged a dramatic fightback to edge out French rivals Clermont Auvergne 16-15 in a thrilling Heineken Cup final.
Jonny Wilkinson admitted Toulon had to dig deep to secure Heineken Cup glory after defeating Clermont-Auvergne.
There will be new name engraved on the Heineken Cup trophy on Saturday when Toulon take on Clermont.
Clermont's inability to control the game late on cost them the Heineken Cup, says Dean Ryan.
Nathan Hines insists Clermont must cope with the pressure when they tackle Toulon in Saturday's Heineken Cup final.
Jonny Wilkinson is among five nominees shortlisted for the ERC European Player of the Year 2013.
Clermont assistant coach Alex King believes Wesley Fofana could have a big impact on Saturday's Heineken Cup final.
Captain Aurelien Rougerie is a doubt for Clermont's bid for Heineken Cup glory against Toulon in Dublin on Saturday.
Juan Martin Fernandez-Lobbe believes Toulon will head into Saturday's Heineken Cup final in the best possible shape.
Ireland's Alain Rolland will take charge of the all-French Heineken Cup final between Clermont and Toulon on May 18.