"Malcom is Malcom," Rivers said. "What he's good at, and what he's done over the last 12 years is who he is. So I don't think we'll ask him to do too many different things out of his comfort zone."
Floyd is third on the team in targets (40) and finished with four catches for 92 yards and two touchdowns against the Ravens last week.
More importantly, Floyd has a good rapport with quarterback Philip Rivers, knows San Diego's scheme intimately and is a tone setter because of his work ethic and production on offense.
But the usually reserved 34-year-old receiver will have to take on even more of a leadership role in the receiver room with Allen place on the injured reserve and Jacoby Jones released.
"My role could possibly pick up," Floyd said. "And I've just got to be ready by taking care of my body and just be prepared for what the coaches are going to throw at me."
Floyd said he talked with Allen and that he's in good spirits.
"We miss him of course," Floyd said. "He seems normal. But if you could imagine the procedure that's he gone through, I'm sure he doesn't feel well."
Rivers said it will be a group effort to fill the big shoes left by Allen's departure from the roster.
Injury update: Several injured players returned to practice on Wednesday for the Chargers, including safety Eric Weddle (groin), cornerback Patrick Robinson (concussion), linebacker Denzel Perryman (arm), center Chris Watt (shoulder), Chris Hairston (knee) and Craig Mager (hamstring).
"It was a walk-through practice, so I was able to go out and do a walk-through -- nothing more than that," Weddle said. "I don't know if I'm playing yet. So I don't want everyone to get all excited."
Inside linebacker Manti Te'o, defensive end Corey Liuget (foot), guard Orlando Franklin (knee), tackle King Dunlap (ankle) and tight end Ladarius Green (ankle) are still out. The Chargers do not have to release an official injury report until Thursday because of the team's Monday night contest against the Chicago Bears.
Roster shuffle: The Chargers made a couple more roster moves on Tuesday, promoting defensive tackle Damion Square from the practice squad to the active roster. San Diego also added four players to the team's practice squad -- receiver Isaiah Burse, safety Matt Daniels, outside linebacker Ben Gardner and running back Dreamius Smith.