The Lions and the Los Angeles Chargers – their upcoming Hall of Fame Game opponent – are the earliest two teams to begin their full training camps. The two teams will face off on July 31 to start the NFL preseason. Head coach Dan Campbell was optimistic as he greeted media in his fifth year at the helm of the team.

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.

Left tackle Taylor Decker is recovering from offseason shoulder surgery and will miss the Lions' first preseason game.

With St. Brown and Williams solidified as the top options, any competition starts with Patrick and the third spot. He was very reliable last year, and as a result he will have a leg up on the competition. However, TeSlaa could make things interesting with a strong camp.

ALLEN PARK -- Second-round picks have started signing their deals around the NFL after flirting with holdouts as training camps begin, and that is very good news for the Detroit Lions.