The New York Knicks will officially rule out forward Carmelo Anthony for the rest of the season later Wednesday, according to sources.

Anthony will undergo surgery on his left knee in the near future, according to sources.

The Knicks’ leading scorer and franchise player has been dealing with soreness in his left knee for months. Despite the injury, Anthony logged 30 minutes in the All-Star Game at Madison Square Garden on Sunday, scoring 14 points on 6-of-20 shooting from the floor.

Prior to the All-Star Game, he said that it was “very likely” he would shut it down after the break.

New York has been cautious with Anthony by reducing his minutes and requiring the 12-year veteran to sit out some games during loaded stretches in the schedule, such as skipping the second night of a back-to-back set of games.

The specific nature of Anthony’s knee injury is unclear.

The Knicks have referred to the injury as soreness. Anthony said it is impacting his tendon and that any surgical procedure would likely sideline him for eight weeks. That timetable would allow him to resume his offseason workouts on schedule and be healthy for training camp, he said.

According to ESPN medical expert Dr. Mark Adickes, tendon issues are common for long-time NBA players.

“If you were to MRI any veteran NBA player, you are going to find abnormalities of their patella tendon insertion or quad tendon insertion,” Adickes said. “The longer you play, the older you are, the more susceptible you are to this injury.”

The Knicks entered the All-Star break at 10-43, the worst record in the NBA.

Information from ESPN.com’s Ian Begley is included in this report.