Whitfield Jr. worked with Roethlisberger during his NFL-mandated four-game suspension earlier this season.
Whitfield Jr. said he will start preparing Newton for pre-draft evaluations on Monday. Whitfield said that Newton came to him on the advice of Hall of Fame quarterback Warren Moon.
"I'm excited and Cam is excited to get to work," said Whitfield. "We'll break it down, assess where he is physically, fundamentally, mentally, emotionally ... all of it."
In one year at Auburn, the 6-foot-5, 248-pound Newton led the Tigers to their first national title since 1957 and a 14-0 season.
Chris Mortensen is ESPN's senior NFL analyst.