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Seattle’s Obafemi Martins could miss “somewhere between three and six weeks,” coach Sigi Schmid said Thursday morning, after the star forward suffered a groin injury in Tuesday night’s U.S. Open Cup loss to Portland at Starfire Stadium.

The injury to his adductor muscle will not require surgery — “so that’s a positive situation,” Schmid said — but groin problems require notoriously hard-to-predict recovery times. Schmid compared Martins’ injury to the ones suffered by defenders Djimi Traore and Dylan Remick in recent seasons. Traore missed more than half of Seattle’s games last season with a series of ailments before retiring this past offseason.

Martins, 30, set the Sounders’ single season record for goals last season with 17. He also dished out 13 assists and finished second in the MLS MVP voting to Robbie Keane of the L.A. Galaxy. Martins has played in 11 of Seattle’s 15 games so far this season, starting 10 of them while notching seven goals and four assists.

More positively, both forward Chad Barrett and midfielder Gonzalo Pineda are making progress in their respective recoveries, and both they and Osvaldo Alonso practiced on Thursday at Starfire.

The Sounders are also still awaiting word as to whether Clint Dempsey will suffer any additional punishment following his ejection from Tuesday’s match. The club is expecting a decision prior to this Saturday’s home match against San Jose, owner Adrian Hanauer said Thursday, “today, maybe. But we don’t know.”