Len already had surgery to "stabilize" the partial stress fracture in his left ankle in May and the recovery time for that surgery was expected to be four to six months.
The 7-foot-1 Len averaged 11.9 points and 7.8 rebounds for the Maryland Terrapins last season and was the fifth overall selection in last month's NBA Draft.
As a precautionary measure, our medical staff determined that it would be prudent to perform surgery on Alex Len's right ankle at this time," said Suns President of Basketball Operations Lon Babby in a release. "That surgery was successfully completed this morning. As part of a routine evaluation, our medical team identified the very beginnings of a stress fracture in Alex's right ankle even though Alex was entirely asymptomatic. We expect him to be available to begin the season."