He was off the pitch from the first minute on Sunday.
Injured from the start during the defeat (24-21) of Racing 92 in the quarter-final of the European Cup on the lawn of Bordeaux-Bègles, the Ile-de-France hooker Camille Chat will remain in the infirmary for a period of six to eight weeks because of a fibula fracture.
A delay announced by the person on Monday evening on his Instagram account.
"Thank you for your messages of support," wrote the French international, who at 25 has 33 caps with the Blues.
Cat is going through a complicated season, marked by injuries.
In December, the player was forced to leave his partners during a European Cup match against Connacht, the victim of a strained left bicep.
In January, a calf injury had caused him to miss the first two matches of the Six Nations Tournament, in Italy and Ireland, with the XV of France.
Last season, the player also missed the start of the Tournament and was injured in the warm-up before the loss to Scotland.
He could miss the dams
It is a hard blow for Racing 92 which receives the Stade Français on Saturday (9:05 pm), to launch its final sprint in Top 14. In the absence of its holder as hooker, Laurent Travers should align Teddy Baubigny, with Kévin Le Guen in appeal on the bench.
The recovery period announced by Camille Chat could cause him to miss the entire end of the regular season, as well as the play-offs, set for the weekend of June 12.
The Hauts-de-Seine club is currently third in the championship.