Oklahoma City Thunder center Isaiah Hartenstein suffered a small, non-displaced fracture in his left hand and will be re-evaluated in five to six weeks, the team announced.

The 7-foot-2 Hartenstein, who is left-handed, suffered the injury during Tuesday’s preseason game in Denver.

The Thunder, ranked No. 1 in the Western Conference, signed Hartenstein to a three-year, $87 million contract in free agency this summer. His addition addressed Oklahoma City’s recurring issues, the Thunder’s biggest weakness last season.

Hartenstein, 26, averaged 7.8 points and 8.3 rebounds per game for the New York Knicks last season.