ESPN's Adam Schefter was the first to report the news of Gronkowski missing the beginning of the workouts.
The Patriots open the voluntary portion of their offseason program on Monday.
Of course, the real takeaway from Schefter's report is that Gronkowski and the Pats "have had good communication" as the tight end works through his decision.
"I'm definitely gonna look at my future, for sure", Gronkowski told reporters. "Sit down the next couple of weeks and see where I am at".More news: Trump's lawyer denies visiting Prague during 2016 campaign
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The Patriots restructured Gronkowski's contract before the 2017 season to add a number of incentives, which the tight end reached during that season.
Even though he's been working out at the TB12 Sports Therapy Center at Gillette Stadium, he still hasn't said whether or not he's playing this coming season.
During the team's annual pre-draft press conference Friday, Patriots coach Bill Belichick made mention that while he expected heavy attendance, there were some players who had "other commitments".
It's unclear whether Gronkowski is angling for more money or a trade. The Patriots star has a $250,000 workout bonus that's based on attending a "percentage" of the voluntary workouts.