Argentine Isa a play-off doubt for Toulon
The 24-year-old loose forward was injured in Saturday's 59-13 thrashing of Castres that assured Toulon of a play-off spot.
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"He needs to see specialists to know more about the seriousness of his injury and the length of absence," Toulon said in a statement.
Earlier on Monday, regional newspaper Var Matin said Isa had ruptured his cruciate knee ligament and his season was over, although Toulon have not commented on that claim.
Agence France-Presse