Reports in recent days have said that Peyton Manning's arm strength and velocity have improved greatly.

Now comes a video posted on YouTube of Manning throwing during his time at Duke University.

Albert Breer of NFL Network has cited a source who confirmed the player throwing in the video is indeed Manning, who is trying to come back after missing all of last year with a neck injury. Manning has been at Duke under the supervision of Blue Devils coach David Cutcliffe, who was his offensive coordinator at the University of Tennessee and his brother Eli's head coach at Ole Miss.

NFL Network said Manning had been throwing to Colts tight end Dallas Clark and receiver Austin Collie, as well as former Colt Brandon Stokley.

Again, the Colts are down to five days before they have to decide whether Manning's future is in Indianapolis or someplace else. He has a $28 million roster bonus due on Thursday.

Follow me on Twitter @TitanInsider247 and @terrymc13

Terry McCormick covers the Titans for TitanInsider.com