The Reds boss missed the game after being taken ill in London, with back-up goalkeeper Brad Jones and head of performance Glen Driscoll also sent home with the bug.
Assistant manager Colin Pascoe and coach Mike Marsh deputised at Loftus Road, although the former was ill himself.
Pascoe was not allowed into the changing room in case he infected the team, so Marsh relayed his notes to the players.
"This morning he phoned me at eight o'clock," Pascoe said of Rodgers. "I wasn't feeling very well myself this morning, but he's worse than me.
"He was very, very white and he woke up not very well.
"The way the medical team and the doctors tried to isolate the players and the staff, they've been fantastic.
"Hopefully they'll have nipped it in the bud and not too many will be affected by it.
"Brendan picked the team. All the preparation for the game was all done.
"The presentations that we do to the players, that was all set for today's game. But unfortunately Brendan woke up and wasn't very well.
"I did the presentations today, but the presentations and everything running up to it was the manager."