Ngata and Grubbs had sat out Wednesday’s session because of back and toe injuries, respectively. Lewis, who had missed the team’s past four games because of turf toe on his right foot, was limited for the second straight day.
Three starters in defensive end Cory Redding (ankle), cornerback Lardarius Webb (left toe) and kicker Billy Cundiff (left calf) did not practice for the second consecutive day.
Cornerback Chris Carr, who has sat out the past three games with a recurring back ailment, was limited for the second straight day.
Rookie running back Anthony Allen (hamstring) fully practiced for the second consecutive day.
For the San Diego Chargers, two starting inside linebackers, Takeo Spikes and Donald Butler, did not practice for the second straight day. Spikes and Butler are dealing with back and foot injuries, respectively.