The New England Patriots picked up the option on the tight end's deal, which means he's under contract through 2019. At his current rate over the next four years, however, he'll be vastly underpaid compared to his worth.
Gronk is set to make a $2.25 million base salary this season, which escalates to $4.25 million in 2017, $8 million in 2018 and $9 million in 2019.
His tweet last month saying the option "basically equals pay cut" was viewed as part Gronk-humor and part disgruntled employee. The tight end clarified his stance after reporting to offseason workouts this week.
"No, that's not on my mind at all," he told USA Today's For The Win, when asked if he had any contract concerns. "I started offseason workouts yesterday. It just feels great to be back with the team working out, getting back in football shape and getting prepared for the season."
While Gronk could easily fetch receiver-type money if he were ever to hit the open market -- and would blow the doors off of Jimmy Graham's deal -- his injury history is also a concern.
In the end, the biggest matchup nightmare for NFL defenses isn't leaving Foxboro for years and years, so worrying about his contract would do Gronkowski zero good.