1:36 PM ET

The tight end will be placed on injured reserve by the Las Vegas Raiders, according to a source.

One month after he was hurt in a loss to the Chiefs, the Pro Bowler will be placed on the injured reserve list.

He won't be allowed to return until the Raiders play the Rams on December 8.

No one is more frustrated by the injury than he is, according to the man who signed a three-year extension just before the season.

"It's not like I'm doing anything to keep myself off the field willingly," he said. I'm doing my best. It's possible that it won't happen in the timetable that I want.

During training camp, he missed a lot of time due to a rightham problem. He has missed eight of Las Vegas' past 14 regular-season games due to injuries he sustained in a Thanksgiving game against the Dallas Cowboys.

He has just 16 catches for 175 yards and one touchdown this season, which is less than he had in the past. One year after he had 90 catches for 1,145 yards and three touchdown, he had a franchise-record 107 catches for 1,196 yards and nine scores.