Westbrook reportedly underwent surgery to repair his zygomatic arch bone. When he returns on Wednesday night, Westbrook likely will wear a protective mask, according to Wojnarowski.
Over 45 games this season, Westbrook has averaged career-highs in points (26.5), rebounds (6.8) and assists (8.1) while emerging as a possible candidate for the Most Valuable Player award.
Oklahoma City (33-27) currently owns the No. 8 seed in the Western Conference.