Denver Broncos starting weakside linebacker Danny Trevathan left Sunday's game against the New York Jets with a left knee injury and did not return.
Trevathan, a former University of Kentucky standout who missed the first three games of the season with a broken leg, was helped to the bench before being carted off the field after his second play of the game.
The Denver Post reported that X-rays were negative and that results of an MRI on Monday will determine the severity of the injury.
"I think it will be good but we won't know until (Monday) when I get the MRI," said Trevathan, who was able to walk without a limp after the game.
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He had a team-high seven tackles in the Broncos' Week 5 win against the Arizona Cardinals, his only full game of the season.
■ Calvin Pryor, a rookie safety out Louisville, had six tackles for the Jets.
Williamson makes big play
Tennessee Titans linebacker Avery Williamson, a rookie out the University of Kentucky, made his second start of the season and made three tackles in a 16-14 victory against the Jacksonville Jaguars.
Williamson, who wore the coach-to-player communication device to anchor the team's defense for the second straight week, recovered a fumble at his team's own 8-yard line and returned it 41 yards to end a Jaguars scoring threat late in the fourth quarter.
"I thought I was gone for a second. I thought I was going to take it to the house," Williamson told The Tennessean of Nashville.
"I was pretty winded with the long run, plus it was at the end of a long drive as well," Williamson added.
Fellow ex-Cat Wesley Woodyard added six tackles.
Cobb scores his 7th TD
Former UK star Randall Cobb had five catches, including a 5-yard touchdown, in the Green Bay Packers' 27-24 victory against Miami.
It was Cobb's seventh TD catch of the season.
"(I'm) just continuing to find a way to get open ... especially when the play breaks down," he said.
Cobb said he expected that the Packers would rally for the winning score, a TD pass from Aaron Rodgers to Andrew Quarless.
"We understand the situation and we're not going to give up or have any doubt until there's four zeros on the clock. As long as we've got time, we know we can make the plays."
Bridgewater, Vikes struggle
Former University of Louisville star Teddy Bridgewater was sacked eight times and threw three interceptions in Minnesota's 17-3 defeat against the Detroit Lions.
Bridgewater was making his second career start after missing last week's game with an ankle injury. The Vikings converted just three of 14 third downs and managed only 212 total yards.
When Bridgewater did have time, he was uncharacteristically inaccurate. He completed 23 of 37 passes for 188 yards and one interception. "
We just have to come back next week and learn from today and move forward," Bridgewater said.
Redskins: Former Henry Clay standout Chase Minnifield, who played in college at Virginia, made the first two tackles of his NFL career in a loss to the Cardinals.
Ravens: Elvis Dumervil (U of L) had three tackles, including 11/2 sacks, in a win against the Buccaneers.