English, a second-year pro, has four tackles and one-half sack in two games, both starts, this season. He played in all 16 games with two starts last season and finished with 36 tackles and two sacks.
"They let me get after it today," Mathews said. "It didn't hurt. I felt like my normal self."
The Chargers also signed three players Tuesday, including veteran Ethan Albright, their fourth long snapper of the season. David Binn (hamstring), James Dearth (foot) and Ryan Neill (knee) all are on injured reserve.
The Chargers re-signed safety Quinton Teal, who was waived at the final cutdown earlier this month, and cornerback Dante Hughes, who was inactive in Weeks 1 and 2. The team waived running back Curtis Brinkley and placed Neill and linebacker James Holt (shoulder) on IR to make roster room.