Chargers' D.J. Fluker to undergo MRI on injured right foot

SAN DIEGO -- A season-long issue last season, the San Diego Chargers have their first injury concern along the offensive line this week.

Guard D.J. Fluker practiced on Monday, but was seen in the locker room on crutches, with his right foot in a protective boot. Fluker will have the injury evaluated further, including an MRI, to fully understand the extent of the injury.

Offensive coordinator Ken Whisenhunt said a focus of training camp has been getting all five starting offensive linemen practicing every snap together to develop some cohesion and chemistry. Last week's 19-3 win over the Arizona Cardinals was the first time the Chargers had all five starters play together in an exhibition game this year.

Fluker played a total of 812 snaps in 2015, missing two games due to lingering concussion symptoms, and two others because of nagging ankle and knee injuries.

The Chargers played 24 different offensive line combinations in 2015, tied for the fourth-most in in the NFL.

A first-round selection by the Chargers in the 2013 draft, Fluker played his first two seasons at right tackle, missing just one game. He moved inside to right guard for the 2015 season.

San Diego's front office picked up the fifth-year option on Fluker's rookie contract, meaning he will be with the team through the 2017 season.

Fluker is scheduled to make $2 million in base salary in 2016 and $8.8 million in the club-option year for 2017.