Don't stick a fork in Eli Manning just yet -- his friend and ex-teammate, Plaxico Burress, is adamant he'll play again in 2020 ... telling us, "It won't be the last you see of him."
Plax LOVED the way 38-year-old Eli played against the Philadelphia Eagles this weekend -- "S**t, I think E-Money held his own!"
And, while most people think Eli will hang it up at the end of the season, the former NY Giants WR says he just ain't convinced Manning's ready to retire.
"I don't think it's the end of the road.