Already ruled out for the rest of the postseason, New York Knicks center Mitchell Robinson underwent a second left ankle surgery on Monday, per multiple media reports.

Robinson, 26, suffered a stress injury to his surgically repaired left ankle last Monday in Game 1 of the second-round series against the Indiana Pacers. He will be re-evaluated in six to eight weeks.

Robinson missed Game 4 of the first-round series against the Philadelphia 76ers after initially reinjuring the ankle. He came back and played three games before being ruled out.

In 31 games (21 starts) of an injury-marred sixth NBA season, Robinson averaged 5.6 points, 8.5 rebounds, 1.1 blocks and a career-best 1.2 steals per game.

Robinson missed 50 games after surgery on a stress fracture in December.

He played five of the Knicks’ six games in the first-round series against Philadelphia and averaged 3.0 points, 7.8 rebounds, 1.4 blocks and 1.2 steals.