"It's tough losing both of those guys, especially because they're so physical," Murray said. "Those are guys you can play on the weak side, in the slot, in both slots on the weak side. You can move them around, which was huge in our offense.
"I feel bad for Marlon, it being his senior year. It's not the way he wanted to go out. But I know we have guys who can step up. They've got to be ready to go."
Murray mentioned freshman Justin Scott-Wesley as one of the players who has to take a bigger role.
Scott-Wesley has only one catch, a 43-yarder against Florida Atlantic. Richt also mentioned Scott-Wesley, saying the freshman "is going to get a little more opportunity."
Mitchell has re-emerged at receiver after opening the season at cornerback. Mitchell has 26 catches, including 24 in just the last five games.
King leads the team with 27 receptions for 551 yards.
"Tavarres King is an outstanding player," coach Mark Richt said Tuesday. "He's a guy we believe in and trust to do well. Malcolm Mitchell has proved to be a play-maker, without any question."
Richt has kept Mitchell familiar with the defensive schemes in case he is needed at cornerback again. Richt said Mitchell's practice time on defense "will be diminished just a little bit more" after Brown's injury.
King and Mitchell are established receivers, but there's little experience behind the two. McGowan, a junior, is a former walk-on who had two catches against Ole Miss.
McGowan has been best known as the player who usually makes fair catches on punt returns. Now he's hoping for an expanded role on offense as Georgia adjusts its depth chart at wide receiver.