The first meaningful playing time of Baylor Scheierman’s professional career will come in the G League.

The Celtics on Tuesday assigned Scheierman, their first-round pick in the 2024 NBA Draft, to the Maine Celtics, who open their season  on Friday at the Long Island Nets.

The move came after a rough preseason and quiet start to the regular season for the 6-foot-6 Creighton product, who’s struggled to find his shot since arriving in the NBA. Scheierman shot just 16.7% from the floor and 17.6% from 3-point range across his five preseason appearances, failing to play his way into Coach Joe Mazzulla’s veteran-laden rotation.

Scheierman only saw action in blowouts during Boston’s first eight regular-season games, scoring four points on 1-for-6 shooting (0 for 4 from 3) with four rebounds and two fouls across 18 minutes.

The lone open rotation spot, vacated by Oshae Brissett’s free-agent departure, went to second-year pro Jordan Walsh, who spent the majority of his rookie season in the G League.

Per league rules, players with fewer than three seasons of NBA experience can be assigned to the G League an unlimited number of times, though they continue to occupy a spot on the parent club’s 15-man roster during their assignments.

Bumping Scheierman down to the minors will afford him opportunities for playing time and development that simply aren’t available with the championship-contending parent club, which is off to a 7-1 start in its title defense.

The Maine Celtics’ roster also features 2024 second-rounder Anton Watson, who signed a two-way contract with Boston after the draft. Mazzulla spoke with both rookies ahead of the Celtics’ season opener, acknowledging neither is likely to see much NBA playing time in the near future.

“There’s nothing harder than being a young player with the Celtics because we’re trying to win championships and develop at the same time, and not many organizations are in both of those spaces,” Mazzulla said on Oct. 21. “So the young guys have to be very, very patient because the roster is top-heavy, and although you may think you’re getting better … when you’re in a situation like the Celtics’ organization, it can be hard to see the growth in that.

“So you just kind of have to be patient. … This is the situation that you’re in. It’s going to get difficult because of that — that impatience. But you’ve just got to work through it.”