A trade to the New Orleans Saints may have saved Jon Dorenbos' life -- because the longsnapper just learned he has a very serious heart condition that was discovered during a team physical.
Dorenbos -- who dominated as a magician on "America's Got Talent" -- was traded from the Philadelphia Eagles to the Saints back in August and had to undergo a medical exam as part of the deal.
Saints coach Sean Payton just told the media ... doctors discovered the 2-time Pro Bowl player had an aortic aneurysm that will require immediate heart surgery.
Payton says, "It's a pretty serious condition."
Dorenbos is 37 years old -- and the news could signal the end of his NFL career -- but who cares as long as he gets healthy.