His representative Benito Perez-Barbadillo said the results of the surgery were expected on Saturday.
Rafael Nadal withdrew from Indian Wells on Wednesday on the eve of his first-round match.
Following a hip surgery, Rafael Nadal's season is all but over.
Rafael Nadal is expected to be released from a clinic in Barcelona on Tuesday after undergoing a successful appendectomy, the world number three's spokesman said.
Moya, a former world number one, joined Nadal's team to work with his uncle Toni Nadal last December and has helped revitalise the 31-year-old's career.