Labissiere found himself in a rotational role for the Trail Blazers to start the season. He garnered 17.2 minutes per game through 33 contests, averaging 5.8 points, 5.1 rebounds and 1.3 assists. His season highs up to the All-Star break were 22 points, 12 rebounds, five blocks, four assists and one steal. On Nov. 21, Labissiere recorded a career-best five blocks, plus 22 points and 12 boards, during a loss at Milwaukee. In late December, Labissiere suffered a knee injury and was unable to play in any January or February contests. On Feb. 6, Labissiere was traded to the Hawks. He did not appear in a game for Atlanta prior to the suspension of the NBA season on Mar. 11.

Labissiere split the 2018-19 season between the Kings and the Trail Blazers. In 13 appearances for Sacramento, Labissiere averaged 2.8 points, 1.8 rebounds and 0.5 assists in 8.7 minutes per contest. In a win over the Hawks on Nov. 1, he had six points and four rebounds in five minutes of play. In a Dec. 17 loss to Minnesota, Labissiere played a then-season-high 29 minutes, finishing with nine points and five rebounds. He was traded to the Trail Blazers on Feb. 7 in exchange for Caleb Swanigan. Labissiere appeared in nine games for Portland, averaging 3.4 points, 2.1 rebounds and 0.6 assists. He notched a season-high 29 points against his former team on Apr. 10, adding 15 rebounds to match his career high in that category. Labissiere appeared in three postseason games, logging 11 total minutes during the Blazers' run to the Western Conference Finals.

Labissiere enjoyed an expanded role with the Kings in his second NBA season. After seeing action in 33 games as a rookie, the former Kentucky Wildcat appeared in 60 games in 2017-18, making 28 starts. His minutes increased as well, rising from 18.5 per game as a rookie to 20.7 in his sophomore campaign. Labissiere finished with averges of 8.7 points, 4.8 rebounds and 1.2 assists per game. He was also more active defensively, doubling his blocked-shot output to 0.8 per game. Labissiere shot 44.8 percent from the field and set a new career high by knocking down 80.5 percent of his free throws. He scored a season-high 23 points on 10-of-15 shooting in a Jan. 22 game against Charlotte. Labissiere had another 20-point effort against Minnesota on Feb. 26. The 21-year-old scored in double figures 22 more times on the season. He also grabbed 10 or more rebounds on four occasions, headlined by a season-high 15 boards against Charlotte on Jan. 2. That game counted as one of his three double-doubles on the year.

Labissiere was drafted in the first round (28th overall) by the Suns and traded in a draft-day deal to the Kings. The Haitian big man saw action in 33 games for Sacramento, averaging 8.8 points, 4.9 rebounds and 0.8 assists in 18.5 minutes per contest. Among qualified rookies, he ranked ninth in points and fourth in rebounds per game. Labissiere went off for 32 points along with 11 boards on Mar. 15 against Phoenix despite coming off the bench. He scored 21 of those points in a massive fourth quarter en route to a 107-101 win. His other top offensive effort came Apr. 9 against Houston, when Labissiere poured in 5 points on 10-of-12 shooting against Houston -- adding six boards, three assists and two steals. That was part of a strong season-ending run in the starting lineup for the rookie, but he posted a number of strong performances before then. On Mar. 24 against Golden State, Labissiere nearly notched a triple-double, finishing with 10 points, 10 rebounds and eight assists. He registered a career-best four blocks against the Magic on Mar. 13.