Cruden hobbled off in Montpellier’s 36-26 European Champions Cup clash with the Glasgow Warriors on Saturday (Sunday NZ time) with Montpellier coach Vern Cotter concerned about his immediate playing future.
“It seems like something he already had,” L’Equipe reported Cotter as saying.
Cotter said Cruden – in his first season at Montpellier on a $3.6 million three-year deal – would have a MRI scan on Monday (NZ time).
But L’Equipe indicated the former Chiefs star could be out for several weeks.
Cruden, 28, has a history of knee injuries.
He suffered a knee hyperextension in the All Black’s 2011 Rugby World Cup final over France and had to leave the field.
Cruden missed the 2015 Rugby World Cup title defence after knee surgery following a ruptured ACL ligament.
The Montpellier first five-eighth was hit by a tackle from Glasgow’s Matt Smit in the 67th minute after combining with former Crusaders wing Nemani Nadolo to set up a Montpellier try.
Watching from the stands was Glasgow coach Dave Rennie, Cruden’s former mentor at Manawatu and the Chiefs.