D.C. United forward Fabian Espindola is set to miss 2-4 weeks with a hamstring injury.
Espindola was injured in Saturday's 3-0 win against the New England Revolution and was replaced by Alvaro Saborio.
United coach Ben Olsen told the Washington Post that Espindola will have an MRI scan on Tuesday.
"Hopefully, we get a surprise and it's a mild injury," Olsen said.
Espindola has scored three goals in five starts after missing the start of the season with another hamstring injury.
With Espindola out, Boca Juniors loanee Luciano Acosta scored his first goal of the season against the Revs.