Citing sources, ESPN reported that Manning will have the exam in March, which is required in his contract. If the exam shows that his neck is stable, Manning plans to return to the Broncos next season. However, if there is an increased injury risk, Manning may retire.
Manning, 37, set NFL single-season records for passing yards (5,477) and touchdowns (55) in 2013.
Manning had fusion surgery on his neck in 2011, which weakened his throwing arm and forced him to miss the entire season. He was then released by the Indianapolis Colts. He signed a five-year, $96 million deal with the Broncos in 2012.
In Manning's first year in Denver, the Broncos lost to the Baltimore Ravens in the AFC playoffs. In 2013, the Broncos went 13-3 and got the No. 1 seed in this year's playoffs. Manning threw for two touchdowns and led a clock-killing drive in the waning moments as the Broncos held off the San Diego Chargers 24-17 on Sunday to advance to the AFC championship game.