Chicago Bears cornerback Charles Tillman has been placed on season-ending injured reserve with a ruptured triceps muscle.
He suffered the injury during the third quarter of the Bears' 28-20 victory against San Francisco on Sunday night.
"I know this feeling way too well, but this isn't the end of the road for me," said Tillman, who suffered a torn triceps in the same arm in November. "As I rehab my injury, my role will transition to helping coach and support my teammates. I will be at Halas Hall and do everything I can to help our team reach its goals."
"That's really sad to hear," receiver Brandon Marshall said Monday on The Brandon Marshall Show on ESPN Chicago 1000. "He's one of our leaders on this team and much needed. It's sad for the city, it's sad for our team, it's sad for him.
"It's just bad news because he's just one of those players who brings something to the game that most people can't."
ESPN's Adam Caplan reported earlier that Tillman was headed for the season-ending IR.
Tillman signed a one-year, $3.25 million deal in March -- of which $750,000 was fully guaranteed.
He took to Twitter on Monday to thank fans for all of the support.
I know this isn't the news we all wanted to hear but as they say, stuff happens. I'm truly blessed to have so much support from you all.
- Charles Tillman (@peanuttillman) September 15, 2014
Tillman sustained the injury when he appeared to become tangled up with a 49ers player near the sideline. Immediately after the injury, head athletic trainer Chris Hanks and a team physician ran tests on Tillman, who appeared to be in considerable pain.
A 12-year veteran and two-time Pro Bowl selection, Tillman (152 career starts) ranks third in franchise history with 36 interceptions. He leads the franchise in career interception return yardage (675), interception return touchdowns (8) and defensive return touchdowns (9).
Tillman leads the NFL with 42 forced fumbles since 2003. He is the only player since 2003 to record 40 forced fumbles and 30 interceptions.
Information from Adam Caplan and Michael C. Wright of ESPN.com contributed to this report.