Marcell Dareus is in the building. 

That was the word from Rex Ryan on Monday. The star defensive tackle returned to One Bills Drive after serving a four-game substance abuse suspension. 

The Bills won’t waste any time getting him back into the lineup. 

“I expect him to play,” Ryan said. “He has already been delayed four games. So yeah he will play. What capacity, how much he really plays I am not sure. He is definitely going to play.”

The status of Dareus’ reported outpatient rehab is less clear. Ryan wasn’t sure if it was completed when he met the media Monday afternoon. 

“I am not going to get into specifics on what he is doing off the field or anything like that,” Ryan said. “My understanding is he is in good spirits and looking forward to getting back out there with his teammates.”

Dareus will certainly add to a defense that has allowed only 16 points the last two games combined, including the first ever shutout of the Patriots at Gillette Stadium. Albeit, without Tom Brady. 

Ryan was less sure on the playing status of the other suspended Bill who could return on Monday: Seantrel Henderson. The Bills will take a wait and see posture with the offensive tackle. 

There was no additional information on Sammy Watkins Monday. 

The Bills will have to cut two players from the roster to accommodate Dareus and Henderson. Ryan said the team would be in no haste to make those moves. They have a week to decide.