The NFL Players Association told USA Today Sports that it hopes the Washington Redskins will upgrade the turf at FedEx Field after two players suffered knee injuries and the playing surface was so bad that one player said he felt like he was "working in a sweatshop."

Robert Griffin III tore up his knee playing on the messy FedEx Field playing surface Sunday. John McDonnell/The Washington Post/Getty Images

There were plenty of bare spots, and dirt was flying with many of the steps taken between the hashmarks Sunday when the Seattle Seahawks won the wild-card playoff game against the Redskins. Washington quarterback Robert Griffin III and Seattle defensive end Chris Clemons left the game with knee injuries.

Seahawks coach Pete Carroll called the playing conditions "horrible" in a radio interview earlier this week.

On Wednesday, NFLPA spokesman George Atallah weighed in on the playing conditions.

"The head coach and players have said themselves that the field was not up to snuff," Atallah told USA TODAY Sports. "We certainly hope that they upgrade it."

Seahawks fullback Michael Robinson said the NFL should step in if it really cares about its players.

"You care about us, but we play on that field last week that was like, 'Really? Really?' That should be illegal," Robinson said, according to USA Today Sports. "That's like working in a sweatshop to me."

The field has looked scraggly for much of a season that was front-loaded with extra events, including college football games and a Kenny Chesney concert.