Frei, 27, was Toronto's longest-tenured player and is the club's all-time leader in appearances across all competitions (99). He holds a 1.54 goals against average in 82 regular-season starts, but has missed much of the past two seasons because of injury.
"Stefan is a goalkeeper we have liked for a number of years," Sounders coach Sigi Schmid said in a press release. "He is a quality professional who brings experience and leadership to the position. Adding Stefan at this point of his career was very attractive to us."
Frei, who has 19 career shutouts, made 81 appearances in his first three seasons with Toronto before suffering a broken fibula in 2012. He's made just one league appearance in the past two seasons.
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