Schefter adds Gronkowski is still considering whether to play in the upcoming NFL season, but has had "good communication" with New England.
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.
ESPN's Mike Reiss reported the five-time All-Pro has a $250,000 workout bonus in his contract for 2018 that he would receive in the event he attends a certain amount of his team's offseason program.
Gronkowski has dealt with numerous significant injuries during his career, leading to retirement rumors after Super Bowl LII.
Schefter also confirmed reports that Tom Brady will also not attend the Patriots' first workout Monday. Brady is in Qatar supporting Best Buddies, a charitable organization.