Update 12:21 p.m.: A person familiar with the situation said that Robert Griffin III’s knee surgery was completed just after noon Wednesday.

Dr. James Andrews repaired both Griffin’s lateral collateral and anterior cruciate ligaments, the person said. According to that person, Griffin plans to remain in Florida for the foreseeable future to be monitored and begin his rehabilitation. The initial six to eight weeks of recovery are considered critical key to his rehabilitation, the person said.

Update 10:57:   While conducting surgery to repair the torn lateral collateral ligament in Robert Griffin III’s right knee, Dr. James Andrews found that the quarterback’s anterior cruciate ligament “needs to be stronger,” according to a person with knowledge of the situation.

It wasn’t immediately clear whether the ACL could be repaired, or if it would be completely replaced. Andrews already is repairing Griffin’s LCL.

Griffin’s surgery, which began at 7 a.m, was going well overall, the person said. There was no word on how long the procedure would take.

The Redskins haven’t responded to requests for information on the surgery or the condition of Griffin’s knee, which was determined when he was examined by Andrews in Gulf Breeze, Fla., on Tuesday.

Mark Adickes, the orthopedist who performed Griffin’s original ACL surgery in 2009, declined to comment, saying that he is consulting with the Griffin family and physicians at this time.

A person familiar with the situation said around 7 a.m. that Robert Griffin III’s surgery was underway. The person said Griffin’s lateral collateral ligament will be repaired and doctors will determine the extent of damage to his anterior cruciate ligament.

That person denied a report by ESPN saying doctors already had diagnosed a complete ACL tear. It’s possible that extensive damage to Griffin’s ACL will be found but doctors had not determined that to be the case prior to the surgery, the person said.

Before heading into surgery Griffin tweeted a message of thanks.