Eastwood had been having issues for some time with doctors unable to diagnose the issue after “10,000 tests”.

"I almost blacked out and almost crashed, sort of freaked out a bit and went to see the doctor," Eastwood told Seven News.

But with doctors having difficulty delivering a prognosis, Eastwood returned to pre-season training.

However, the issues returned when he took to the paddock with the forward suffering a traumatic episode due to an irregular heartbeat.

"Heart-rate went from 140 to 240 just out of nowhere," Eastwood said.

He underwent emergency surgery with doctors keeping him awake for the procedure.

The 30-year-old has returned to training once again and will undergo further tests next month.

The results of those tests will determine if he can continue his 247-game top flight career with retirement a real possibility.

But for now, Eastwood is hopeful that won’t be the case.

“It’s good to be back and it’s a bit scary but I am glad to be back with the team,” he said.