Goalkeeper Chris Seitz suffered a sprained right shoulder during Real Salt Lake's 2-0 loss to Kansas City at Rio Tinto Stadium on Saturday night, and is expected to miss at least a month.
That could force third-string back-up Kyle Reynish into action at D.C. United next weekend.
Seitz already was playing in place of injured regular starter Nick Rimando, who has missed the last three games since suffering a deep cut on his finger two weeks ago. Rimando had four stitches removed from his finger on Saturday, but it's unknown whether he will be available to face his former team when RSL attempts to win its first road game of the season.
Seitz was injured when he collided with defender Jamison Olave in the 67th minute, as both made sliding attempts to stop the Wizards' Josh Wolff from scoring his team's second goal. Neither was successful, and Olave's knee rammed into Seitz's shoulder.
The keeper stayed down in pain for several minutes, but finished the game while clutching his arm close to his body, trying not to move it. Seitz was taken to the hospital after the game for tests, which a team spokesman said revealed a grade-2 separation of the AC joint in his shoulder. He will miss four to six weeks, spokesman Trey Fitz-Gerald said.
If Reynish is forced into duty, he will be making the first start of his Major League Soccer career. The 25-year-old played 55 minutes in relief of Rimando when Rimando was injured in a 2-0 loss at Colorado, and allowed a goal in the only MLS action of his three-year career.