Before he threw a single pass for John Elway and the Denver Broncos, Peyton Manning had reportedly already worked out and took a physical for the San Francisco 49ers in a super sneaky workout and meetings in Durham, North Carolina earlier this week according to ESPN.

Both offensive coordinator Greg Roman and head coach Jim Harbaugh were in attendance for the workout Tuesday at Duke University, who described it to an ESPN source as 'very impressive.' They then asked for a follow up physical, getting Manning checked out on Wednesday in the Durham area as well.

Peyton still has to meet with delegates from the Tennessee Titans before he really starts to sit down and make some decisions, though he's visited the Broncos and Cardinals already. Some unconfirmed developments such as the Seattle Seahawks parking a jet in Denver in a failed attempt to visit with No. 18 have occurred as well, according to ESPN's sources.

For more on the Niners chances to sign Peyton, head over to Niners Nation.