Williams, 29, was photographed on Sunday in one of the parties that were organized after the Oscars, but fell ill the next day and entered the Cedars-Sinai Medical Center in Los Angeles, where he had to be operated .
The doctors discovered the clot after Williams traveled to New York last week to be a foot injury that has kept out of the tracks from Wimbledon. "Last week, Serena suffered a pulmonary embolism (blood clot in the lungs) and the hematoma was an unexpected shock," revealed his spokeswoman Nicole Chabot. "Luckily all was discovered in time. With continued visits to doctors, is recovering at home under close medical supervision," he said.
Williams has not run competitively since Wimbledon after suffering a cut on one foot at a restaurant in Germany. The U.S. has suffered at least two operations on his foot and was preparing to return to training soon.
The former world number one has won 13 Grand Slam titles, but dropped to eleventh place in the ranking during this break and facing an uncertain future. "I know I'll be fine, but I'm praying and I hope to put this behind us soon," he said. "Although I can not make promises now on my return, I hope to return in early summer. That said, my main goal is to make sure to get there safely," he said.
Meanwhile, Williams' mother, Oracene Price, said his daughter is recovering well and thanked posts by fans and colleagues as the Belgian Kim Clijsters. "Thanks for the concern. She is very good," Williams wrote the mother through 'Twitter'.
"Pulmonary embolism occurs when a clot lodges in a lung vessel (...) anticoagulant therapy is warranted and required hospitalization in the initial stages of treatment," reads the play 'applied to GP sport 'by Micki Cuppett and Katie M. Walsh. A minimum of three months of anticoagulant therapy, during which it is not recommended sports collision or contact, the authors add.
