The 2021 49ers' quarterback room will NOT be icy ... Jimmy Garoppolo just revealed he'll mentor his future replacement Trey Lance -- explaining he's got no beef at all with the rookie QB.
Garoppolo could be just months away from losing his job to the ex-North Dakota State signal-caller ... the Niners drafted Lance #3 overall last week, and it's only a matter of time before he takes over in SF.
But, Jimmy said on the Keyshawn, JWill & Zubin show on ESPN radio that won't impact their relationship one bit .