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The 35-year-old defender had previously been training with the Portland Timbers, even scoring a goal against the Sounders in a preseason game.
In a sign of just how shallow the Seattle Sounders are in terms of experience at center back, former-Manchester United defender Mikael Silvestre is now training with them after apparently being let go by the Portland Timbers. The 35-year-old most recently played for Germany's Werder Bremen and has spent time with some of the biggest clubs in the world. Along the way, he's picked up 40 caps for France.
As decorated as Silvestre is, he's also well on the downside of his career and has not played professionally since the end of the 2011-12 season.
This does seem to create a somewhat interesting roster battle as Silvestre would seem to be competing for a spot with Djimi Traore, another former Champions League winner.
At the same time, the Sounders also announced that they had cut trialists Leo Lelis and Shavar Thomas and draft pick Lebogang Moloto, whose MLS rights the Sounders presumably retain.