Leigh Steinberg -- the inspiration behind "Jerry Maguire" -- says there won't be a sequel to the classic film, but a movie about his life is very likely ... and the NFL super-agent knows which actor he wants to portray him.
It's not Tom Cruise (been there, done that) ... Leigh tells TMZ Sports he has his sights set on Zac Efron or Jake Gyllenhaal.
FYI, Steinberg currently reps Patrick Mahomes .