According to club information, Alex Abrines of FC Barcelona Lassa underwent surgery on his acute appendicitis on Thursday night.
The surgery will sideline Abrines for the Round 8 home game against Olympiacos Piraeus, marking the first game Abrines will have missed this season.
The club has not established a return date for Abrines, who has averaged eight points and 1.6 rebounds in 17 Turkish Airlines Euroleague games this season.
Abrines, a 6-foot-6 shooting guard, was selected by the Thunder with the 32nd overall pick in the 2013 NBA Draft. He's played each of the past 3 1/2 seasons with FC Barcelona.