The Atlanta Hawks didn’t need Trae Young to beat the Boston Celtics to open NBA Cup play two weeks ago.

But the Hawks would have kept money in their pockets if they had played the star guard.

The NBA announced Tuesday that it is fining the Hawks $100,000 for violating the league’s player involvement guidelines. Young was excluded from the competition due to right Achilles tendonitis, but the NBA deemed he was actually healthy enough to play.

“After an investigation, including review by an independent physician, the NBA concluded that the Hawks excluded Young from a game in which he could have participated in accordance with the policy’s medical standards,” the NBA released in a statement . “The organization’s conduct violated the policy designed to encourage participation in the NBA regular season.”

The game against the Celtics was the only game Young has missed so far this season. The three-time All-Star returned to the Hawks lineup in the very next game after the win over Boston and played 33 minutes in the double-digit win over the Washington Wizards.

The Hawks stunned the Celtics 117-116, without Young, as Dyson Daniels scored a career-high 28 points. It’s one of three losses Boston has suffered this season, and the Celtics haven’t lost since then, rattling off six straight wins.

For the Hawks, defeating the Celtics was important when it came to the NBA Cup. Atlanta is at the top of Group C and can surprisingly move into the knockout rounds with a win over the Cleveland Cavaliers on Friday.