According to the San Antonio Spurs, rookie guard Lonnie Walker IV underwent an MRI examination this morning in San Antonio that revealed a right medial meniscus tear.

The injury occurred at the 6:55 mark of the fourth quarter of last night’s Spurs-Pistons preseason game. Walker IV will undergo surgery in San Antonio on Monday, Oct. 8. The procedure will be performed by Spurs team physician Dr. David Schmidt.

A timeline for his return will be determined at a later date.

Walker was drafted 18th by the Spurs in the 2018 NBA Draft.