France's Mermoz gets Six Nations call-up
Dumoulin, 26, who has eight caps, suffered a left knee knock in Racing 92's European Champions Cup loss at Glasgow on Saturday.
"Medical tests this morning [Tuesday] revealed nothing serious but a period of rest is necessary," a statement issued by the France team said. "Alexandre rejoins his club to continue his treatment."
Mermoz has 30 caps with his last call-up against England during last year's Six Nations tournament.
The 29-year-old was called up to take part in the final day of a training camp ahead of the Six Nations.
The final list of players will be revealed next week with the first match against Italy in Stade de France on February 6.
Also sidelined injured for the three-day training camp this week were wing Benjamin Fall, scrumhalf Morgan Parra and lock Sébastien Vahaamahina.
France squad:
Forwards: Eddy Ben Arous (Racing 92), Jefferson Poirot (Bordeaux-Bègles), Uini Atonio (La Rochelle), Rabah Slimani (Stade Français), Guilhem Guirado (Toulon, cap.), Camille Chat (Racing 92), Yoann Maestri (Toulon), Alexandre Flanquart (Stade Français), Bernard Le Roux (Racing 92), Paul Jedrasiak (Clermont), Yacouba Camara (Toulouse), Damien Chouly (Clermont), Wenceslas Lauret (Racing 92), Louis Picamoles (Toulouse), Antoine Burban (Stade Français), Kevin Gourdon (La Rochelle).
Backs: Sébastien Bézy (Toulouse), Baptiste Serin (Bordeaux-Bègles), Maxime Machenaud (Racing 92), Jules Plisson (Stade Français), Jean-Marc Doussain (Toulouse), Jonathan Danty (Stade Français), Maxime Mermoz (Toulon), Wesley Fofana (Clermont), Gaël Fickou (Toulouse), Rémi Lamerat (Castres), Marvin O'Connor (Montpellier), Virimi Vakatawa (FFR), Maxime Médard (Toulouse), Hugo Bonneval (Stade Français), Scott Spedding (Clermont)
Agence France-Presse
