Chargers Head Coach Jim Harbaugh provided a handful of injury updates on Monday at The Bolt.

Tight ends Charlie Kolar and David Njoku are both going on Injured Reserve after each suffered injuries in Sunday's game against the Raiders.

Harbaugh said Njoku suffered a fibula injury and that Kolar has a forearm injury.

Kolar and Njoku must each now miss a minimum of four games, and their injuries mean Oronde Gadsden will be the lone tight end remaining on the active roster.

"A lot of confidence in Oronde's game," Harbaugh said. "So many things that he does well. A lot of confidence in Oronde."

Harbaugh also noted that the Bolts are likely to explore additions to the tight end room going forward.

"It's something we're working with the personnel department and the team," Harbaugh said. "We're going through that today."

Harbaugh also said the left guard Kayode Awosika (fibula) and defensive tackle Dalvin Tomlinson (hamstring) are expected to "miss some time."

Harbaugh said Trevor Penning will assume the starting left guard spot.