Seattle Sounders midfielder Mauro Rosales just posted the below to his Twitter account:
Im Sad! For Recommendation of the doctor and coach i will take a rest on this game to be 100 % in the next one, sorry.. I will miss you Ss.less than a minute ago via Twitter for BlackBerry® 
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Mau Rosales
mdr7
While Roasles' injury does not appear to be anything serious, his being unavailable puts the Sounders in a fairly tight spot. Seattle is now without Rosales, Steve Zakuani and O'Brian White meaning that 3/5ths of Sigi Schmid's first-choice front line are unavailable. If the Sounders stick with the 4-2-3-1 expect Erik Friberg and Alvaro Fernandez to start at the wide midfield positions, but don't rule out a different look either. This level of attrition might call for some creative thinking.