Lauri Markkanen will miss the rest of the season.

Markkanen has been shut down after battling fatigue down the stretch, the team announced Wednesday.

UPDATE: Lauri Markkanen has been undergoing tests to determine the cause of an episode of a rapid heart rate & fatigue during the game in Toronto. Additional testing has been recommended and Markkanen will not return for the remainder of the season.

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— Chicago Bulls (@chicagobulls) March 28, 2019

This comes a few hours after the Bulls announced a medical update for the 7-foot forward, stating he remained overnight in Toronto because he experienced "extreme fatigue" during Tuesday's loss at the Raptors.

Markkanen was seen and evaluated by the team's medical staff before he underwent further examination at a local hospital after the game.

UPDATE: Last night, Lauri Markkanen experienced extreme fatigue during the first half of Chicago’s game in Toronto. Although he was stable, it was determined that further testing was warranted, and he would remain in Toronto overnight.

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— Chicago Bulls (@chicagobulls) March 27, 2019

While speaking to reporters after the game, Bulls coach Jim Boylen said Markkanen "was feeling a little sluggish" after a few hard practices caught up with him.

Markkanen, selected by the Timberwolves with the No. 7 pick in the 2017 draft before promptly being traded to Chicago, is averaging 18.7 points and 9.0 rebounds in his second season.

The 21-year-old finished Tuesday's outing with 10 points and nine rebounds.