The Seattle Sounders announced today that star forward Clint Dempsey is having a medical evaluation for an irregular heartbeat. Due to this development, Dempsey will not play this Sunday against arch rival Portland. No other details are being made public at this juncture.

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Now in his fourth year with the club, Dempsey has eight goals and two assists this season.

Unbeaten in five consecutive matches under Interim Head Coach Brian Schmetzer, the Rave Green gear up for their last regular-season match on Sunday at Providence Park. Kickoff is at 2:00 p.m., with ESPN televising the match nationally. Seattle is a single point behind the Timbers and the San Jose Earthquakes for the sixth and final MLS Cup Playoffs position.