For nearly a decade Tom Brady and Rob Gronkowski formed one of the NFL's most dynamic offensive duos. So, when the two players were seen at a private workout earlier this week, nothing really seemed out of place. Except for the fact that Gronkowski is now retired.

Brady and Gronkowski took part in the workout on the campus of UCLA Monday. The tight end retired in March after a nine-year career in New England that should one day land him in the Pro Football Hall of Fame. The former All-Pro tight end is in Los Angeles for the second annual Monster Energy $50K Charity Challenge Celebrity Basketball Game set to tip off at UCLA’s Pauley Pavilion on Monday night.

According to TMZ, Gronk said the workout went well.

“It was great working out,” Gronk told TMZ. “Tom needs someone to throw to so, you know, he calls Mr. Reliable Robbie G the one and only!”

Gronkowski, 30, told The Rich Eisen Show last week he’s enjoying retirement, but said, “I can’t really say how I’m going to feel about it when the games start rolling around and everything.”

Gronkowski caught 522 passes for 7,861 receiving yards and 79 touchdowns over 115 regular-season games in New England. He made five Pro Bowls, earned four first-team All-Pro nods and three Super Bowl rings.

His departure leaves a considerable void on New England's roster, but one that Brady is confident the team will be able to fill.

Brady and the Patriots will report to training camp in Foxborough on July 25.