The seven-foot six-inch (2.3-meter) Yao injured his ankle during the first quarter of Houston's 98-91 loss to the Washington Wizards on November 10 and has not played since.
"...the area of the surgery in and around the bone is completely healed and the structural integrity of the foot is intact," the Rockets said on their website (http://www.nba.com/rockets).
"(Yao) is expected to be out a minimum of two weeks."
The 30-year-old Chinese missed all of last season after suffering a fractured bone in his left foot and having an operation on the injury.
Seven-times All-Star Yao has averaged 10.2 points and 5.4 rebounds in five games during this campaign with Houston limiting his minutes in an attempt to prevent injury.
(Writing by Mark Lamport-Stokes in Los Angeles; Editing by Rex Gowar)