Peyton Manning again sheds no light on future at Las Vegas speech

Peyton Manning touched on the limitations he's faced playing quarterback in recent years while speaking at a health care conference in Las Vegas against the backdrop of next week's deadline to announce whether he will retire or continue his NFL career.

Manning was the keynote speaker at a conference of IT health care professionals at The Venetian Las Vegas.

While considering this particular audience, he pointed out that "the medical world put my next back together" in 2011. He had a series of surgeries that allowed him to prolong his career.

Manning, who turns 40 on March 24, has played 18 seasons. He led the Denver Broncos to victory last month in Super Bowl 50 after a regular season in which he struggled and missed seven starts with a tear in the plantar fascia near his left heel.

He told the crowd that he was "keenly aware of his physical limitations this year" and had to rely on "attitude and mental diligence" to reach his goals.

On leadership, he said, "I'm not nimble. My vision is to compete against the very best at the highest level."

Manning must decide by 4 p.m. ET on Tuesday which turn his career will take, because his $19 million base salary for 2016 would be guaranteed the following day.