Less than three weeks after declaring for the NBA Draft, Alex Len has undergone foot surgery and will miss all pre-draft workouts. The surgery was announced by Sports International Group of Gaithersburg, which represents the 7-foot-1 Maryland product.

Len had surgery to stabilize a partial stress fracture of his left ankle. It was performed in Charlotte, by Dr. Robert Anderson. Len will be sidelined for four to six months. Several NBA 7-footers have had their careers cut short by stress fractures including Yao Ming, Bill Walton, and Sam Bowie.

“This was a preventative measure,” Anderson said in a statement. “Although it is possible that this injury could have healed on its own, surgery was felt to be the safest and surest option to ensuring a long and successful NBA career for Alex. His prognosis is excellent, and I anticipate he’ll make a full return to basketball within the next few months.”

According to the statement, Len was diagnosed with the injury after he declared for the draft on April 15. Len averaged 11.9 points, 7.9 rebounds, and 2.1 blocks last year for the NIT semifinalist Terrapins. Most draft websites have Len going between No. 5 and No. 10 overall.

“The tough part about Alex’s injury is the timing,” Michale Lelchitski said in a statement. “Everyone who knows Alex knows that he would have been incredible in the pre-draft workout setting. However, Alex is one of the elite prospects with arguably the biggest upside of anyone in the draft. The most important thing is his long-term health.”