An anonymous Detroit Lions players has said that teammate Ndamukong Suh does not know what it takes to win in the NFL.
The defensive tackle has come in for criticism recently, following incidents against the Houston Texans and Indianapolis Colts.
His teammate told Yahoo! Sports: "Yeah, we're loaded, but we have a couple of guys who don't understand what it takes to win. Just making a couple of plays and thinking that makes you great.
"Ndamukong would be first. He's focused for 90% of the time, but it's the 10% that kills you.
"With [Suh], he loses his cool and all of a sudden we're blowing a play or dealing with some controversy."
Suh has received almost $250,000 (£156,000) in fines since being drafted in 2010.