Charles, who leads Georgia with 44 catches for 572 yards and five touchdowns, said he has sought input from New York Jets tight end Dustin Kellar, Tampa Bay receiver Mike Williams, former Georgia tight end Ben Watson and former NFL coach Tony Dungy.
Murray said he doesn't know what Charles will do.
"I don't think he knows at all yet either," said Murray, friends with Charles since high school.
Tony Pauline, NFL draft analyst for SI.com, tweeted this month that, according to sources, Charles will enter the draft. "No, don't believe that," Charles said.
Charles and Rambo, also a junior, are among Georgia underclassmen submitting paperwork to the NFL's college advisory committee, which provides feedback on where they could be drafted.
They say they'll make decisions after the Jan .2 Outback Bowl. The NFL deadline to enter the draft is Jan. 15.
"I've been thinking about it but I've got that one more game of college football that I'm trying to enjoy," Rambo said.
One attraction to returning is the chance to win the SEC title.
"I never had a chance to win any ring playing any sports," Rambo said. "Next year will be a great year for us to go out there and win."
Charles is projected as a second-round pick and Rambo a third-round pick, according to Rob Rang, senior analyst for NFLDraftScout.com.
The 6-3, 241-pound Charles could be a matchup nightmare as a receiver hybrid, Rang said.
"He is also helped by the fact that other than Stanford's Coby Fleener, this isn't a particularly strong senior class of tight ends," Rang said.
The 6-foot, 218-pound Rambo "is fighting more of an uphill battle because of the fact that this looks like a pretty solid class of safeties. Considering his size, big hitting and ball skills there are a lot of things to like about Rambo," but he "may lack the fluidity to remain at free safety in the NFL and the physicality he's shown has already led to some durability concerns."
Outside linebacker Jarvis Jones, a third-year sophomore and consensus All-American, said "there's no reason" for him to send in paperwork since he long decided to return.
"I love being here," Jones said. "I love the guys I play with. I love my coaches. I don't think I'm ready to let that go yet."
Murray, a redshirt sophomore, submitted his name to the NFL committee because he was curious to see what they said.
"There's no chance of me leaving," Murray said laughing, but he didn't rule out that possibility after next season.
Samuel will join TB competition
Richard Samuel, coming off ankle surgery, is expected to play in the Outback Bowl, but isn't likely to practice fully until the team practices in Tampa after Christmas.
He'll be part of an open competition at tailback.
"Do you guys think anybody established themselves as a solid starter at the tailback position?" coach Mark Richt asked reporters. "I'm not seeing that."
Tailback Carlton Thomas (knee) was limited in practice Friday.
This and that
Georgia athletic director Greg McGarity wouldn't confirm or deny a report out of Missouri that Missouri's first SEC game will be against the Bulldogs in Columbia, Mo., but said there's a "good chance," the Bulldogs will be playing there early next season. …Georgia practiced Friday under warm conditions. "It felt like the first day of spring ball," Richt said. "There was a lot of lively competition. I think we had a little scrap here and there." …Linebacker Mike Gillard (ankle) is still in a walking boot, but Richt said "we are hoping he can play." …Punter Drew Butler and end Derrck Lott both are sidelined with ankle injuries.