Detroit Lions CB Ennis Rakestraw Jr., who left practice Sunday with an upper body injury, is expected to miss "a few days," coach Dan Campbell said.

With much speculation about who will take over the starting center job, rookie lineman Tate Ratledge has emerged as the favorite to begin camp.

The NFL season is underway. The road to San Francisco for Super Bowl 60 begins in the grueling summer heat. Some teams have new coaches. A couple of old coaches have new teams. Star players have switched uniforms. There are position battles to determine. And, plenty of storylines to watch.

With NFL training camp season upon us, Kevin Patra provides a refresher on the Detroit Lions' roster changes, position battles and notable subplots.

Trainers attended to Rakestraw on the sideline before taking him inside and off the field, walking tight to his side helping him to the back.

This week coming, training camp will officially begin for every team in the NFL, although the Chargers have already gotten the summer off and running due to their participation in