LEHIGH, Pa. (CBS) — Philadelphia Eagles defensive tackle Mike Patterson will likely require further treatment following Wednesday’s seizure at training camp.

During a news conference Thursday, Eagles head athletic trainer Rick Burkholder said the 6-foot-1, 300 pound Patterson is still undergoing tests and has what doctors believe is a congenital condition known as arteriovenous malformation or AVM, which is a tangling of blood vessels near his skull.

“We’re pretty sure that’s what caused the seizure,” said Burkholder. “We’re pretty sure it is not football related.”

Patterson’s agent JR Rickert issued the following statement refuting claims he has received an official diagnosis:

“Media reports are not accurate. Mike has not yet decided on surgery. He has not received an official diagnosis of a brain AVR and is continuing to be evaluated by multiple doctors. Once we know the course of treatment and timetable for recovery, Mike and his wife Bianca will decide how to proceed.”

Burkholder said they expect Patterson to be released from Lehigh Valley Hospital at some point Thursday to return to his South Jersey home and follow up with doctors in Philadelphia.

Although exact treatment will have to be determined, the Mayo Clinic lists treatment usually includes radiation, surgery, depending on size, or a less invasive procedure called Endovascular embolization.

Patterson suffered a seizure while practicing drills on the field at training camp Wednesday. He was immediately rushed to Lehigh Valley Hospital where Buckholder said he received great treatment.

At this time, Buckholder said it is unclear when Patterson will return to football.

Patterson, 28, was the Eagles’ first-round pick out of USC in 2005. He’s started 84 games and played in 95, the most of anybody on the current roster.