Thursday morning, news broke that Chicago Bulls star Lonzo Ball suffered a torn meniscus tear last week and could need surgery to repair it. Otherwise, he would be able to play through the injury.

Just hours later, the team announced that he will need arthroscopic surgery on his left knee, and is likely to return in six to eight weeks.

NBA insider Shams Charania tweeted the update Thursday afternoon.

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Ball has missed the Bulls’ last three games due to the injury, which he suffered in their loss to the Golden State Warriors last week.

This is a huge loss for the Bulls, who are already playing with a depleted roster. Lonzo’s absence on the court is just one of many for the Bulls. Starting small forward Javonte Green and starting shooting guard Zach LaVine have both missed multiple games due to their respective injuries. Green has missed the Bulls’ last 10 games after suffering a strained groin back in December.

The Bulls are currently at the top of the Eastern Conference with a winning record of 28-15. They are heading on a three-game road trip and will attempt to extend their lead in the east even farther. The road trip kicks off with the Bulls vs Milwaukee Bucks Friday night.