Montpellier flyhalf Johan Goosen has been ruled out for up to six weeks with a foot injury.
The 26-year-old, who retired from rugby in 2016 before joining the Top 14 runners up ahead of this season, has already missed a month and a half of action with an ankle issue.
Montpellier are at risk of failing to reach the playoffs as they sit in a surprising ninth place in the league.
Vern Cotter’s outfit has already been knocked out of the European Champions Cup.
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