Jim Harbaugh says no NFL teams have called him for an evaluation of Colin Kaepernick, but he's prepared to give a glowing recommendation.

Harbaugh was the San Francisco 49ers' coach when Kaepernick was drafted by the team in 2011 and had his greatest success in the NFL.

Kaepernick's agents requested permission from the 49ers on Feb. 26 to seek a trade for their client.

"Anybody that talks to me is going to get a great recommendation that's going to knock their socks off," Harbaugh told the newspaper in a telephone interview.