Will Ferrell is reportedly concerned about "over exposing" Ron Burgundy by appearing in a Robin Thicke music promo.

The 46-year-old actor and American singer have recorded a version of Christopher Cross' 1980 track Ride Like the Wind for the soundtrack on the eagerly anticipated Anchorman sequel.

There has been talk of them shooting a video to accompany it, but scheduling has proved tight. A collaboration between the pair during Will's planned appearance on Jimmy Kimmel Live on December 19 has been mooted, although the actor is apparently concerned about the effect it might have on his newsreader character.

"Everyone's on board for a proper music video, but Will's concerned about his schedule. He fears Ron Burgundy will be overexposed," an insider told the publication. "But Will would like Robin to join him on some of his TV appearances, such as Conan and Jimmy."

Will appeared on the Conan show last week, but the only way for Robin to join him would have been to pay out $100,000 to shelve another appearance.

While promoting the sequel to the hit 2004 feature Will has appeared as his on-screen alter ego at several big events.

The last was at the MTV European Music Awards in Amsterdam earlier this month, where Robin performed.

On Sunday he is set to cover the Canadian Olympic curling trials in the country's capital city Winnipeg in character for the sports channel TSN.