Jarrett was hindered by a quadriceps injury throughout training camp, but he is eager to begin the season and plans to be in the starting lineup when the Trojans play at Arkansas on Sept. 2.
Jarrett said the transition from Leinart to John David Booty has been smooth.
"John David is striking it," Jarrett said. "His arm is definitely as strong as Matt's, or even stronger, but at the same time he's accurate so I can't complain about it."
After watching Bush, White and three other 2005 teammates forgo remaining eligibility and make themselves available for the NFL draft, Jarrett is in no hurry to decide whether he will do the same.
"Right now, I'm here and planning on staying," he said. "I'm not even thinking about that.
"I'm just trying to win with my team and enjoy the college experience. All that will come later. It's always going to be there. I'm just trying to have fun now."