Rob Gronkowski's recent reconnection with Tom Brady sparked speculation that the tight end will suit up next season. 

On Monday, sources confirmed that Brady closed off the field at UCLA to host a private workout session before he reports to training camp. It appears that Brady wanted the company of a familiar face, as he tapped his former teammate to catch a few passes. When asked about the session, Gronk told TMZ that the GOAT calls him when he needs some consistent receiving.

"It was great working out," Gronk said. "Tom needs someone to throw to so he calls Mr. Reliable, Robert G, the one and only."

Although Gronk seems to be to loving retirement, a recent visit to the The Rich Eisen Show suggests that might change. Gronk said that he "can’t really say" how he's going to feel once "the games start rolling around and everything." This competitive nature led sources to disclose to Bleacher Report's Mike Freeman that Gronk's return is almost certain. "The belief is that once the season gets going, and Gronkowski starts missing football, he will rejoin the team," Freeman wrote. "It's not just a hunch, sources say; you can count on it."

During his nine-year career, Gronk recorded 7,861 receiving yards and 79 touchdowns. He was also a four-time First-Team All-Pro player, selected to five Pro-Bowls, and won three Super Bowls. Unfortunately, this impressive career was derailed by various injuries, which led Gronk to step away from the gridiron in March. But even though he's called it quits, many feel that Gronk has some fuel left in the tank. Gronk and those close to him have added to these speculations with his recent workout with Brady and the remarks he's made about the upcoming season.