Clermont lock Jamie Cudmore dislocated his shoulder in the French Top 14 leaders' European Cup semifinal win over Munster but should still make the Final.
The Canadian was forced off a minute before half-time of the 16-10 victory in Montpellier after dislocating his right shoulder.
But New Zealand coach Vern Cotter is optimistic his second rower will make the final on May 18 against either Toulon or Saracens.
"He's dislocated his right shoulder, he'll undergo some tests Sunday and then we'll know if there are any complications or not," he said.
"It happens to him quite often. He often uses his shoulders in a match and they're damaged. I believe it'll be ok in three weeks [for the Final]."