After the Patriots posted on Instagram Friday that training camp began in six days, Brady responded in the comments section with "2 days actually !" and used the hashtag "earlyreporters."
Brady skipped New England's organized team activities in May, though Patriots owner Robert Kraft downplayed the quarterback's absence.
"These are voluntary workouts. ... I think he's in great shape," Kraft told reporters. "I think he's at an age where he's blessed to have three children, has responsibilities. It's hard to fulfill those during the season."
The 40-year-old Brady said at the Milken Institute Global Conference he was trying to find ways to spend more time with his family:
"Football is year-round for me. It's a lot of thought, a lot of energy and emotion put into it, but I need to invest in them, too. My kids are 10, 8 and 5. They're not getting younger, so I need to take time so I can be available to them, too. ... I've really spent the last two or three months doing those things, and I think I'm really trying to fill my tank up so that when I do go back, I can go back and I think I'll actually be, in my mind, a better player, a better teammate, because I'll be really rejuvenated."
Patriots veterans aren't required to report until Wednesday.
Brady is coming off one of the best seasons of his storied career. He was named NFL MVP for the third time after leading the league with 4,577 passing yards and throwing 32 touchdowns to eight interceptions to help the Patriots reach their eighth Super Bowl since 2001.