The Boston Celtics announced Thursday that superstar point guard Kyrie Irving will miss the remainder of the regular season as well as the postseason due to injury.

Irving, who is in large part the reason the Celtics are in position to secure the number-two seed in the East for the playoffs, will have surgery Saturday to remove two screws from his knee that were inserted to repair a fracture in 2015, ESPN reports. A bacterial infection was reportedly found near the screws during Irving’s most recent surgery on March 24. The surgery on Saturday will be to remove any remaining infection, according to the report.

The team said no further damage has been done to Irving’s knee and he is expected to make a full recovery in four to five months. A team source added that the presence of bacteria is common in surgeries that include hardware.

The news comes at the worst possible time for Boston. After acquiring Irving in a blockbuster trade with Cleveland, the Celtics have surged to the NBA’s fourth-best record (53-25), and were expected to be a formidable road block for the Cavaliers in the playoffs. On the season, Irving averaged 24.4 points, 5.1 assists and 3.8 rebounds, his first in a Boston uniform.