King Dunlap returns to the clubhouse after the first day of mini camp in 2015. Photo by Chris Stone.

For the last three weeks the San Diego Chargers have been without starting left tackle King Dunlap and starting left guard Orlando Franklin, but both players are on track to return Sunday against the Oakland Raiders.

Dunlap and Franklin were full participants in practice Wednesday and Thursday, the first time the two were able to practice fully since sustaining their injuries.

Dunlap suffered a concussion against the Minnesota Vikings Week 3, it was his fourth concussion since 2012. Franklin injured his ankle that same week.

After not practicing Wednesday, Chris Hairston was a limited participant in practice Thursday, although he may not have to start this week with the possible return of Dunlap and Franklin.

More good news for the offensive line is that center Chris Watt was a limited participant in both Wednesday and Thursday’s practice after passing the NFL‘s concussion protocol. He’s also dealing with a groin injury.

D.J. Fluker continues to battle an ankle injury he suffered Week 1 and was a limited participant Thursday after not practicing Wednesday.

The only starting lineman that hasn’t appeared on the injury report this week is Joe Barksdale, who has been a utility man of sorts with the array of injuries to his fellow lineman.

The Chargers play their first divisional game against the Raiders at 1:05 p.m. Sunday  at Qualcomm Stadium.

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