Montreal Impact midfielder Justin Mapp will undergo surgery on his left elbow and likely miss four months, the team announced on Tuesday.
Mapp sustained a dislocation and fracture in the elbow in the second half of Montreal's match with D.C. United on Saturday. Mapp collided with D.C. United goalkeeper Bill Hamid after Hamid saved Mapp's one-on-one shot in the 82nd minute of Montreal's season-opening 1-0 loss.
The midfielder met with team doctors on Tuesday afternoon and is scheduled for surgery on Thursday.
Impact coach Frank Klopas regretted the loss of the midfielder, but emphasized the depth the team had built at the position.
"It's not easy to replace him, but we have a lot of depth out wide," Klopas said. "With the changes we made, we wanted quality depth at every spot."
The 30-year-old was starting his fourth season in Montreal and is one game short of 300 regular-season appearances. Mapp entered MLS with D.C. United in 2002 as a Project-40 player, and has spent time with the Chicago Fire and Philadelphia Union. Since joining the league, he has 22 goals and 65 assists.
Montreal is 0-1 so far this season after finishing last season 6-18-10.