Broncos add Pittman to running back mix

A few weeks ago, the Broncos toyed with the idea of signing Dominic Rhodes or Shaun Alexander, but on Tuesday, they got serious, reaching an agreement with former Buccaneers halfback Michael Pittman.

Pittman's agreement came at a time the team has some concerns about Travis Henry's slow recovery from an offseason hamstring injury.

The 32-year-old Pittman is a physical back. He rushed for 286 yards on 68 carries for a 4.2 yard average last season.

John Clayton covers the NFL for ESPN.com.