SAN DIEGO -- Veteran tight end Antonio Gates suffered a knee injury on the final drive in his second game back against the Green Bay Packers.

Gates missed his second straight practice on Thursday and had treatment on his knee.

However, the 35-year-old veteran hasn’t been ruled out for Sunday’s game against the Oakland Raiders and doesn’t need a lot of practice time to get ready for game days. So Gates still could find his way back onto the field.

“Coming back we know he’s still fresh off of missing the first four weeks,” Chargers offensive coordinator Frank Reich said. “And he knows what it’s like to prepare. So if there’s a chance he plays on Sunday, if anybody can be ready with a minimal amount of practice time, it’s Antonio.”

Chargers head coach Mike McCoy added, “I have no concern with the preparation part of it. He’ll be ready to roll.”

Along with Gates, linebacker Manti Te’o (ankle), receiver Keenan Allen (hip), safety Eric Weddle (groin), cornerback Craig Mager (hamstring) and linebacker Tourek Williams (foot) did not practice on Thursday.

Guard D.J. Fluker (ankle), tackle Chris Hairston (ankle) and running back Melvin Gordon (ankle) returned to practice on Thursday as limited participants.

Receiver Stevie Johnson (hamstring) and center Chris Watt (groin, concussion) were limited participants for the second straight day.

Tackle King Dunlap (concussion), linebacker Kyle Emanuel (shoulder) and guard Orlando Franklin (ankle) were full participants for the second straight day.