(UPDATED on 5/11/16 at 11:15 a.m. ET with a statement from Dr. Marcio Tannure.)

Anderson Silva is resting comfortably after successful surgery this morning.

Silva’s physician, Dr. Marcio Tannure, today told MMAjunkie the former longtime UFC middleweight champion successfully had his gallbladder removed. He expects Silva to leave the hospital on Friday.

As reported on Tuesday, Silva (33-7 MMA, 16-3 UFC), who was slated to fight fellow 185-pounder Uriah Hall (12-6 MMA, 5-4 UFC) on Saturday’s UFC 198 pay-per-view main card, was forced off off the lineup after experiencing abdominal pain.

“Anderson Silva started feeling abdominal pain and cramps from Monday to Tuesday,” stated Tannure, who’s also a medical consultant for the UFC in Brazil. “He was seen by a doctor at the hospital, where they did a few (lab tests) and didn’t detect anything out of the ordinary. He came home on Tuesday, but he was still in pain, still feverish, so he contacted me, and I told him to go (to the hospital) to see the medical staff I knew. They did all the labs, and he was diagnosed with acute cholecystitis, which is an inflammation of the gallbladder. It doesn’t really have a specific cause. It can happen at any time.

“The surgeon decided it was a surgical case, and he was hospitalized at that same moment. I was there. I followed the procedure. Everything went well. It went as expected. He is expected to be discharged on Friday. The medical staff is going to follow his recovery and see when he’ll be able to get back to doing physical activities. With this type of surgery, recovery usually takes from four to six weeks. We expect everything to go well and that he returns as soon as possible.”

As a result of Silva’s surgery, Hall has also been forced off the card, which takes place at Arena da Baixada in Curitiba, Parana, Brazil.

Silva’s coach Luiz Dorea told MMAjunkie the Brazilian fighter complained of “very, very strong” and “unbearable” pain prior to his scheduled flight to Curitiba on Tuesday. Silva, who was also vomiting, then went to the hospital to undergo tests while Dorea boarded.

The coach said Silva, who looked to rebound from a January loss to Michael Bisping, was disappointed by the bad luck. However, he said they’re fortunate that the symptoms appeared when they did.

“It could have burst, and it would have been more serious,” he said. “He was doing so well, so motivated. It’s a shame. What a horrible situation. We’ve been in the fight business for so long. We couldn’t imagine something like this. He was so motivated to fight in Brazil, in Curitiba, and this happens. Unfortunately, there’s nothing we can do. He did his part. He trained, he worked hard, he was ready … (and) almost on weight. And then out of the blue, the night before (his flight), the unbearable pain (arrived). We’re all shocked.

“I can imagine he’s very upset because he did everything he could to fight here. Thankfully, it wasn’t worse – this pain that comes out of the blue didn’t happen during the fight. It’s very dangerous when it bursts.”

For more on UFC 198, check out the UFC Rumors section of the site.