ESPN's Adam Schefter was the first to report the news of Gronkowski missing the beginning of the workouts. Moreover, it wouldn't be much of a shock to see the Patriots use one of their draft picks later this month on selecting a tight end to build organization depth at the position.
The further along this situation moves into the offseason, the more likely it could become a more pressing issue. This would be a significant amount of money that he would be stepping away from in the prime of his career. He's posted at least 1,000 yards and 8 scores in three of the last four seasons.
Although Patriots' owner Robert Kraft recently claimed he was unfazed by his star tight end's retirement murmurs, it appears Gronkowski has yet to make a decision regarding his 2018 playing status. Until then, it is still a fluid situation with his National Football League future still up in the air.