The midfielder had surgery to repair broken bones suffered in a match versus the Colorado Rapids.
Zakuani will remain at Rose Medical Center in Denver for several days before returning to Seattle.
Zakuani was injured in the third minute of Friday night's match against the Colorado Rapids. He was taken from the field on a stretcher.
Colorado midfielder Brian Mullan was red-carded for the foul on Zakuani.
Zakuani was the Sounders FC co-leader with 10 goals in 2010. He entered Friday's game as the team's points leader with two goals and two assists.
The Sounders went on to win the match, 1-0, on a goal by Fredy Montero.
Follow Goal.com on to get the latest soccer news directly. Check out Goal.com's page; be part of the best soccer fan community in the world!