Donald Butler, Jarret Johnson questionable for Monday night

AP

Two Chargers defensive starters sat out practice on Saturday and are listed as questionable for Monday night’s game against the Colts.

Inside linebacker Donald Butler (groin) and outside linebacker Jarret Johnson (hamstring) were among three San Diego players who didn’t participate on Saturday, according to the club’s injury report. Left guard Chad Rinehart, the other player who did not practice, has been ruled out with a toe injury.

Butler is second on the Chargers with 31 tackles, while Johnson has recorded a team-high three sacks.

Starting right tackle D.J. Fluker (calf) is also listed as questionable. He was a limited participant in practice on Saturday, as was reserve cornerback Richard Marshall (groin). Marshall returned to practice on a limited basis on Saturday after sitting out Friday.

Seven Chargers players are listed as probable, including tailback Ryan Mathews (concussion), who put in a second consecutive full practice on Saturday.