D.C. United midfielder Marcelo Gallardo and defender Gonzalo Peralta have flown to Munich to have a specialist determine if they will need surgery for sports hernias.
The players are definitely ruled out of this weekend's SuperLiga match against Houston, and could possibly miss three league matches.
Gallardo, the Argentine playmaker brought in this year as United's first Designated Player, has missed the last four games. He has not played since going 90 minutes in a 4-1 win over Los Angeles on June 29. Without him, the side has lacked creativity in the midfield, winning two U.S. Open Cup matches then losing their two opening group play matches in Superliga.
Argentine defender Peralta, 27, also has not played since the L.A. game, when he went the full 90.