The Broncos said their weakside linebacker has what's called a medial tibial impaction fracture. He does not any torn ligaments.
Trevathan, who didn't put any weight on his left leg after being carted off the field during team drills, is expected to return to the Broncos right around their bye week in late September, meaning he'd only miss three regular-season games, at most.
He was hurt on an 11-on-11 run play in which center Will Montgomery rolled over him.
Trevathan, a sixth-round draft choice out of Kentucky in 2012, is coming off a breakout season in which he led the Broncos with 124 tackles and intercepted three passes before leading the team with two dozen tackles in the playoffs.
Scandrick apologizes for suspension
Dallas Cowboys cornerback Orlando Scandrick blamed his positive drug test that led to a four-game suspension for violating the NFL's policy on performance-enhancing drugs on a recreational drug he took in Mexico that he didn't know contained an amphetamine.
Scandrick took the blame for the error Tuesday and apologized to his family, teammates and organization for the mistake that will force him to miss the first month of the season.
"It was just a bad decision," he said. "I should have never done it. I didn't do it with the intent of knowing it would test positive. I know we get random tests but I don't take anything to enhance my performance. I wasn't taking anything to enhance my performance."
Scandrick tested positive in April but appealed the penalty. The suspension was upheld Monday and the league officially announced the suspension Tuesday.
The Seattle Seahawks say accusations that star running back Marshawn Lynch was involved in an assault and damage of personal property are "bogus."
In a statement Tuesday morning the team says it has "the utmost respect for the investigative process," but that after speaking with Lynch, the Seahawks concluded the allegations were without merit.
The Bellevue Police Department released a statement Monday saying the alleged incident took place around 2:30 a.m. Sunday and that Lynch is alleged to have been involved. Bellevue police are investigating.
The incident was reported by a female about 12 hours after it allegedly took place at a downtown Bellevue apartment. Police say there was no domestic violence or sexual assault involved in the allegation.
The police department had no new information to release on Tuesday.
Head coach Pete Carroll didn't offer much further comment on the matter.
"I'll just go along with the statement that we made for right now and support whatever the statement was from the club," Carroll said. "It's not a topic for us right now. We're not talking about it."
The Cleveland Browns signed unrestricted free-agent quarterback Rex Grossman and waived quarterback Tyler Thigpen. ... Arizona Cardinals Coach Bruce Arians said safety Tyrann Mathieu is "pretty close" to coming off the physically unable to perform list and could be practicing with the team within a week. Mathieu tore ligaments in his left knee on Dec. 8. ... Pro Bowl safety Eric Berry left the Kansas City Chiefs' practice for the second time this training camp as he continued to be bothered by tendinitis in his right heel.