Stabbed officers have surgery in Vic

The federal police officer repeatedly stabbed by a terror suspect will likely require more surgery.

The Australian Federal Police (AFP) officer was stabbed three to four times while a Victorian officer received a slash to his arm before he fired a shot that killed the 18-year-old man outside Endeavour Hills police station.

The AFP officer is in a serious but stable condition in hospital after suffering stab wounds to his neck, stomach and head.

AFP acting commissioner Andrew Colvin said the policeman underwent surgery on Tuesday night, mainly for the abdomen wound, and would need more surgery to repair the damage.

"He still has some way to go and some more surgery," Mr Colvin told reporters on Wednesday.

"Although both officers are in a stable condition, we should be under no illusions about the seriousness of their injuries."

Victoria Police chief commissioner Ken Lay said his officer had a nasty slash to his arm.

"We are a little worried about that. (It's) obviously not life-threatening but quite a serious injury," Mr Lay said.

The leading senior constable underwent surgery on Wednesday afternoon.

Mr Lay said the officers would get help to recover from the physical and mental trauma of the attack.

"These were two young men who turned up to work, doing their job, keeping their community safe, in a very, very difficult environment, and came across a person who seemed to me to have one thing on his mind," Mr Lay said.

Police Association of Victoria secretary Ron Iddles declined to comment on specifics of the case but said police should be mindful of increased security concerns.

"All police need to be more vigilant," he said.

"The decision to use a firearm is never taken lightly and that police member will need to live with the consequences of that for the rest of his life."