ALTHOUGH out of immediate danger, Adelaide veteran Brent Reilly remains in intensive care at Royal Adelaide Hospital after having surgery on Monday to repair a fractured skull.

The 31-year-old will remain under close observation for the next few days as he recovers from the operation, which involved inserting a plate to stabilise the fracture.

The Crows released a statement saying Reilly was resting and asked for privacy.

Club doctor Andrew Potter is expected to update media on Reilly's condition on Tuesday morning.

Reilly received the injury in an accidental head knock during training on Monday morning.

He received immediate help from club doctors at West Lakes but was rushed to the Royal Adelaide Hospital in an ambulance where he was diagnosed with the skull fracture.

Forwards coach David Teague said Reilly was hit by a teammate who was leading for the ball during an ordinary drill.

Teague said it wasn't a sickening collision, just unlucky.

"He was going into surgery late this afternoon, I'm guessing he's probably in there at the moment," Teague told Adelaide-based radio station 5AA on Monday afternoon.

"It wasn't a clash of heads, it was just a normal drill; he fell into the oncoming leader.

"It was a big hit but nothing we haven't seen before it was just one of those unlucky ones [where] the force hit the wrong spot at the wrong time.

"We won't know any more until after the surgery."

Reilly was preparing for a crucial 2015 in which he would fight for his career after falling out of Adelaide's best 22 last year.

He played 10 games in 2014, taking his career tally to 203 after he was drafted to the Crows with pick No.12 at the 2001 NAB AFL Draft.

We may be rivals on the field, but everyone at @PAFC wishes @brentcreilly_3 a speedy recovery from his surgery — Port Adelaide FC (@PAFC) February 9, 2015