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Osvaldo Alonso is listed as "questionable" with a left adductor strain on the Seattle Sounders' most recent injury report, according to a team spokesperson. No further clarification was given on the injury, but that would most likely explain why he did not travel with the Sounders for Wednesday's match against FC Dallas.
Missing Alonso would certainly be a blow to the Sounders, who seemed to be getting close to full health. It certainly helps that Real Salt Lake will be without Javier Morales, who did not travel, but Luis Gil provides a very suitable backup at the top of their diamond midfield.
If Alonso can't go, the most like-for-like replacement would be Servando Carrasco. But that was also the case against Dallas when Andy Rose got the nod to start alongside Brad Evans. Rose played well enough, but the partnership with Evans was not particularly smooth as they both seemed to want to occupy the same space. Until Fredy Montero came on in the second half, the team lacked any real fluidity on offense and there was a notable whole in the center of their defense.