Cam Newton jogs onto the field before Patriots practice on Sunday. Newton missed practice on Monday. Steven Senne/Pool Photo via the Associated Press

Patriots quarterback Cam Newton was missing from the start of practice Monday, hours after he led the team over their final practice of training camp.

It was his first absence of the summer. It’s unknown why Newton missed stretching and initial individual drills, although the Herald confirmed the absence was excused, which ESPN.com was first to report.

In Newton’s absence, Brian Hoyer was the lead quarterback in drills watched by the media.

Running back Damien Harris was also absent.

With Harris out, veteran back Lamar Miller appeared at his first Patriots practice Monday, meaning he’s come off the Physically Unable to Play list after missing all of camp. The former Texans back, who underwent surgery to repair a torn ACL a year ago, looked fine in the few drills the media witnessed.

The Pats had four absences at Sunday’s practice: outside linebacker Chase Winovich, defensive lineman Allen, cornerback Michael Jackson and Miller. Allen also missed all of training camp due to injury.

Winovich returned to practice. Safeties Devin McCourty and Adrian Phillips worked on the lower practice field. Wide receiver Jakobi Meyers was once again in a red non-contact practice jersey.

After two lighter practices, the Patriots were in pads Monday.

The Pats are working towards their season opener against the Dolphins on Sept. 13.