Jacksonville Jaguars star Marcedes Lewis says Gus Bradley ain't why the team is losing -- praising the guy as a great coach -- and putting the blame squarely on the shoulders of the players.

With rumors swirling that Bradley could be fired any moment after their 2-5 start, TMZ Sports spoke with Lewis to find out how the team is handling the situation.

"Gus is one of the best coaches I've ever been around," Lewis said. He says the players still have Bradley's back.

When asked about criticism of the coaching staff, Lewis says -- "It's not really about the coaches. They're not playing between those lines every Sunday."