Rivera says Newton's start is "pretty much following the line of what we had planned throughout training camp and that's to go back and forth" with Newton and Jimmy Clausen.
Rivera says the first-team offense will play about one half and that Clausen will get reps with the first team to keep the quarterback competition even.
The coach says he has not made a decision on which quarterback will start the Sept. 11 regular-season opener against Arizona.
He says he'll likely make that announcement next week.
Rivers says by then "we'll have a real good feel for what we're going to do as we go into the regular season."