Boston Celtics rookie Jayson Tatum has impressed during his stint in the Utah and Las Vegas Summer League with his length, athleticism and feel for the game, but he is not content with that just yet.

The No. 3 overall pick was able to witness first-hand what it's like to be in the same court with nine other players that are looking for a roster spot or battling for potential minutes on the court, a rugged, faster-paced, more physical game than the one he played in his only season at Duke.

Having fallen out of contention with a landslide loss to the Dallas Mavericks on Saturday, Tatum will use the rest of his offseason to focus on “getting stronger, getting in better shape and being more physical,” according to the team.

At 6-foot-8, and 205 pounds, Tatum could use some added strength to be able to man the wing at the next level, where much-more physically developed specimens await him in a nightly basis.

The rookie has shown plenty of promise with a refined perimeter game and his exuberant athletic ability, one that coach Brad Stevens hopes he can bring to both sides of the ball.