The Sharks have said only that Couture has an upper-body injury.
Sharks general manager Doug Wilson said no specific return date has been set.
Couture has 14 goals and 21 assists in 43 games this season. After going 11 straight games without a goal, Couture recently scored in four straight. That streak was snapped Sunday in Chicago, but he still had an assist and the shootout winner.
Obviously a lot happened in a short period of time. At the end of the day, considering everything I went through, I really felt close to my teammates and I really feel like what we accomplished, I know we didn't win it all. ... I'm really proud of how we got there and what we did once we got there.
— Rangers forward Martin St. Louis to Jim Cerny of BlueshirtsUnited.com