Jim Harbaugh, often referred to as the Quarterback Whisperer, will spend the summer with another noted developer of quarterback talent.

George Whitfield, 36, a quarterback coach whose pre-draft clients have included Carolina’s Cam Newton, Indianapolis’ Andrew Luck and Cleveland’s Johnny Manziel, joined the 49ers as an intern Monday as part of the Bill Walsh Minority Coaching Fellowship. Whitfield will be with the team through training camp.

Harbaugh got to know Whitfield, who lives in San Diego, when he was the head coach at the University of San Diego from 2004-06. In 2007, Whitfield was an intern with the Chargers under offensive coordinator Cam Cameron, who was Harbaugh’s quarterbacks coach at the University of Michigan.

“We agree on a lot of things,” Harbaugh said. “Haven’t found anything we disagree on. So it’s not like we’ve turned our quarterbacks over to George, but he’s going to augment, going to assist. I think it will be beneficial for us, beneficial for him. It should be a win-win. Always looking for that.”

Whitfield figures to keep busy. The 49ers currently have five quarterbacks on the roster: Colin Kaepernick, Blaine Gabbert, Josh Johnson, McLeod Bethel-Thompson and Kory Faulkner.

Former NFL offensive tackle Bob Whitfield – no relation – also began an internship with the team Monday. Whitfield, 42, had a 15-year NFL career (1992-06) and was a Pro Bowler in 1998. He was the No. 8 pick in the 1992 draft out of Stanford, where his son, Kodi, is a wide receiver.

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As expected, tight end Vernon Davis and right guard Alex Boone did not attend today’s practice. Both players have skipped the voluntary offseason workout program because of dissatisfaction with their contracts.

Asked if he expected Davis to attend next week’s three-day mandatory minicamp, Harbaugh said, “I would expect that, yeah.”