"Forty-six percent (completion percentage)? This is not basketball, that is not good enough," the Philadelphia Eagles quarterback said Tuesday on NFL Network's "NFL Total Access." "He has the mentality to come in and be a leader and all that good stuff, but as far as winning the games throughout the whole season, I don't know. I don't know if he can be my quarterback."
Jackson did praise Tebow for his play in the 2011 playoffs.
"He won a playoff game, he beat the (Pittsburgh) Steelers," Jackson said. "He's done a pretty good job in the playoffs, that's what I can say about him. As far as a consistent season, going throughout the whole year -- he's not consistent."
Jackson said it's hard for any NFL player, particularly a quarterback, to change his style. He has witnessed this firsthand.
"Michael Vick came in, and they (the Eagles) wanted him to pass first and he tried to do a great job of doing that, but he still went back to what he always did, which is run," Jackson said. "That was kind of hard because all you know is what you know.
"That position is a tough position. ... You gotta go out there and improve. I don't think he (Tebow) is going to go too much higher."