Bears defensive end Shea McClellin probably won’t have an immediate opportunity to build on the three sacks he had in Monday night’s victory over the Packers. The reigning NFC defensive player of the week is doubtful for Sunday’s game against the Lions at Soldier Field because of a hamstring injury suffered during Thursday’s practice.

“Tweaked it,” McClellin said Friday as he headed to have an MRI exam. “It happened in one-on-ones.”

Coach Marc Trestman said McClellin was injured “accidentally in a drill.”

“We’ll see how he is tomorrow,” Trestman said, “but I would say right now he’s doubtful.”

Because McClellin suffered the injury so late in the week, he is in jeopardy of missing at least the Nov. 17 game against the Ravens, as well, a source with knowledge of the situation said.

It’s an unfortunate setback for the 2012 first-round pick, who had been criticized for a lack of production through the season’s first seven games yet generated a major confidence boost Monday night.