The LA Galaxy blamed the artificial turf at Minnesota United after multiple players were injured during their game at TFC Bank Stadium on Sunday.
Midfielder Baggio Husidic suffered the worst, breaking his leg while tring to slide in the first half. He had to be stretchered off the pitch.
The MLS club said an extent of the injury would be announced after the 30-year-old sees a specialist on Tuesday.
Joao Pedro also tweaked his hamstring in the game, while Jelle Van Damme reported pain in his knee and afterwards blasted the FieldTurf Revolution surface.
"Honestly, with all respect, this is the worst field I ever played on in this league," Van Damme said. "It can only cause you injuries. I think soccer needs to be played on grass."
Minnesota United is playing at the University of Minnesota's football stadium in its first season in MLS while constucting a soccer-specific stadium that is increasingly unlikely to open before 2019.
"I don't think the turf helped... and I think that stuff needs to be looked at closer," Galaxy coach Curt Onalfo said. "The surface doesn't make for a great soccer game and we picked up a pretty nasty injury so we are pretty upset about it."
The injuries leave the Galaxy short in midfield, with LA already missing U.S. internationals Jermaine Jones and Sebastian Lletget to long-term injuries.
Rafael Garcia and Jaime Villarreal came on as substitutes for Husidic and Pedro on Sunday.