Shannon Sharpe ain't so sure Eli Manning is getting into the Hall of Fame ... the Broncos legend tells TMZ Sports the debate over the QB's candidacy will be "contentious."
We got the FS1 star out at LAX just minutes after Eli had his retirement news conference Friday ... and we asked him straight-up, is the Giants legend Hall of Fame worthy?
"I thought I knew what a Hall of Famer was," Sharpe told us. "But, many years ago. I don't know anymore."
The "Undisputed" co-host seems to think Eli will ultimately get a bronze bust someday .