A string of injury issues has put into question the longevity of Rob Gronkowski's career.

Gronkowski has posted several of the best seasons in NFL history at the tight end position, but the 24-year-old has had multiple surgeries on his forearm and now will undergo back surgery. Gronkowski missed his senior year in college after a major back injury.

The New England Patriots signed Gronkowski to a six-year, $53 million extension in 2012.

The Patriots will have a decision to make on the final day of the 2015 league year when they have a $10 million option bonus. If New England doesn't pick up the bonus, the remainder of his contract would be voided.