Jayson Tatum is already an established NBA veteran entering his ninth season in the league.

But the 27-year-old forward is entering uncharted waters this fall, starting with a training camp where he’ll have to watch from afar as his teammates set the groundwork for a new season.

Even though Tatum posted videos this weekend of himself working out on the court, the star forward still has not set any timeline for a return from a ruptured Achilles tendon.

“This is new,” Tatum said Monday at Celtics Media Day. “I’m figuring it out as I go. Still very much a part of the team, being at practice and the games and things like that. Obviously I won’t be able to participate at practice, so that’s going to be tough, but just being integrated and being around as much as I can while still rehabbing

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