Danny Trevathan
Danny Trevathan registered 129 combined tackles last season. Reuters

The Denver Broncos were dealt bad news on Tuesday upon learning starting linebacker Danny Trevathan will miss six to eight weeks with a fracture in his left knee.

"They told me that my ACL and MCL are fine, but that I have a fracture in my knee," Trevathan told ESPN's Josina Anderson. “The doctor told me I was going to be out four to eight weeks, but I told him four to six. I'm not tripping. I will bounce back. I'm a soldier."

Trevathan was carted off the field during intense 11-on-11 drills. The 24-year-old had not missed a game after two seasons in the NFL. He led Denver with 124 tackles in 2013.

The Broncos are expected to go with Brandon Marshall as the first choice to replace Trevathan as a starter. Marshall played his rookie season with the Jacksonville Jaguars in 2012, and joined the Broncos in 2013. He has only played six games in his career.

The Broncos season starts on Sept. 7 when they host the Indianapolis Colts.