Collingwood coach Nathan Buckley believes goals scored immediately before, on, or after the siren should be open to review by the third umpire.

Buckley's comments were prompted by a goal kicked by Adelaide forward Josh Jenkins kicked on the stroke of three-quarter time against Collingwood.

However, Jenkins' goal may have in fact been kicked after time had expired, as the Adelaide Oval crowd noise appeared to drown out the siren.

According to the existing rule, the quarter is only officially over once the on-field umpire makes his signal upon hearing the siren.

While acknowledging Jenkins' goal had no bearing on the Magpies' 21-point loss last Thursday, Buckley said it was imperative that those sorts of decisions were made correctly.

"When you've got something like that where a little bit of external help might help, I think anything that happens on the siren should be taken out of the on-field umpire's hands," Buckley said on Tuesday.

Buckley also referenced Jaeger O'Meara's shot at goal in the St Kilda-Gold Coast game at the weekend, where the half-time siren sounded momentarily before the ball hit the young Suns midfielder's boot.

"If we're ever in that circumstance, you should go upstairs to see if the siren went before or after contact and just get the decision right," Buckley said.

"If we're going to use technology for goal-line reviews, we may as well use it and get it right."

"It's worth having a look at."

Meanwhile, Buckley is glad Sydney Swan Dan Hannebery escaped suspension for his clash with Bomber Michael Hurley.

Buckley said he thought Hannebery approached the contest with the right technique, while Hurley left himself "open" to contact.

The Magpies coach warned of the importance of teaching the right technique when approaching a contest to avoid serious injury.

"I just hope at junior level that the coaches are still telling players to still turn their body and win the ball, rather than leading with their heads," Buckley said.

"If you have too many leading with their heads, as Michael did, it's probably going to result in greater injury.

"So we still need to be teaching technique. Whilst you want to legislate for things, you've got to teach players to protect themselves."