In September 2015, Bourousis signed a contract with the Spanish team Saski Baskonia. On December 30, 2015, he was named Spanish League Player of the Month, after being MVP of the week three times in the first half of the 2015–16 ACB season. He repeated his win again as the Spanish League's Player of the Month in January 2016, after averaging 18.5 points per game and 7 rebounds per game, including 24 points scored in the win against Real Madrid. On May 23, 2016, he was named the Spanish League's MVP of the 2015–16 season, after averaging 12.9 points per game, 7.1 rebounds per game, 2.2 assists per game, and 0.9 steals per game.