Castres number eight Alex Tulou had to undergo surgery on Wednesday after suffering an injury.
The American Samoa-born loose-forward will be out for at least three months after injuring his arm according to Rugbyrama.
The injury happened in a defeat for Castres against Racing last weekend.
The loss of Tulou will be a big blow, given Tulou's power off the base of the scrum and his prominent role for Christophe Urios and his side throughout the current campaign.
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