Aaron Long - 2014; did not make an appearance for Seattle Sounders.
Jordan Morris - 2018; remove from Seattle Sounders II. He never played for them. He missed all of 2018 due to injury. He should be listed under Seattle Sounders for 2018 with 0 appearances/goals.
Justin Meram - add to Atlanta United. Made 9 appearances for Columbus Crew prior to his move.
Francisco Calvo - add to Chicago Fire. Made 7 appearances and scored 1 goal for Minnesota United FC prior to his move.
Jonathan Lewis - add to Colorado Rapids. Made 6 appearances for New York City FC prior to his move.
Abdul Rwatubyaye - add to both Colorado Rapids and Colorado Springs Switchbacks. Prior to his move he made 1 appearance for Swope Park Rangers and 2 appearances for Sporting Kansas City.
David Accam - add to Columbus Crew. Made 8 appearances and scored 4 goals for Philadelphia Union prior to his move.
David Guzmán - add to Columbus Crew. Made 5 appearances for Portland Timbers prior to his move.
Lawrence Olum - add to Minnesota United FC.
Sam Cronin - remove from Minnesota United FC.
Omar Browne - add to Montréal Impact.
Xavier Arreaga - add to Seattle Sounders. Made 10 appearances for Barcelona Guayaquil prior to his move.
Joevin Jones - add to Seattle Sounders. Made 28 appearances and scored 2 goals for SV Darmstadt 98 prior to his move.