Manning has been conducting aggressive throwing sessions in shoulder pads and helmet since Tuesday at Duke, where his former University of Tennessee offensive coordinator David Cutcliffe is now the head coach.
It is Mannings second trip to work under the supervision of Cutcliffe.
Among those who have joined Manning in Durham, NC, include Colts teammates Dallas Clark and Austin Collie, as well as former teammate Brandon Stokley, sources said.
Manning was spotted at a local Durham restaurant Friday evening signing autographs during dinner, a source said.
Manning has increased his throwing regimen as Colts owner Jim Irsay contemplates a decision on whether to exercise a $28 million option by Thursday.
Manning and Irsay also have had conversations about the veteran quarterback continuing his career as a Colt even though it is a certainty the team is set to use the No. 1 overall 2012 draft pick for Stanford quarterback Andrew Luck.
Several sources have told ESPN during the past month that Mannings throwing strength has dramatically improved as his nerves continue to regenerate following his latest neck surgery Sept. 8.
Doctor Robert Watkins, who performed the single-level cervical fusion, has stated publicly that he has cleared Manning to resume his playing career.
Colts owner Jim Irsay has stated Manning still needs to pass a team physical even though sources have said that Colts neurosurgeon Dr. Hank Feuer has also told Manning it would be safe to resume his career.
via Source — Indianapolis Colts Peyton Manning throws in Duke University workout – ESPN.