Celtic boss Ange Postecoglou declared Celtic will be "hard to stop" if they maintain their current form after watching the Bhoys tear Rangers apart in a 4-0 Old Firm derby success.

A Liel Abada brace, as well as goals from Jota and David Turnbull, moved the scintillating Scottish Premiership champions five points clear of their historic rivals in the early-season table on Saturday.

Celtic are now unbeaten in 38 league games, and have scored 25 goals in their opening six matches of the 2022-23 campaign.

Speaking to the BBC after the win, Postecoglou said: "We have been in excellent form and I'm really proud of the players.

"It was a big game today, we knew that, a big occasion against a really good team, and I thought the boys were outstanding from start to finish."

Asked about the importance of the Hoops' commanding lead over Rangers in the standings, the Australian said: "What's more important to me is how we're playing, every week we've got a little bit better, and that's a good indicator. 

"That's a better indicator. You can win games in many ways and grind things out, but our form's been outstanding.

"If we can keep going like that, we're going to be hard to stop."

Postecoglou's counterpart Giovanni van Bronckhorst, meanwhile, was left deflated by a series of defensive errors as he pledged the Gers will not make the same mistakes in the future.

"You know the start you have is very important in how the game will develop," he said. "We knew the threat they had with quick throw-ins and free-kicks.

"We were exposed twice, which gave two goals away. For me, that's very disappointing. We knew they were going to [restart quickly] and still we weren't prepared enough.

"Everyone needs to reflect in what they did well and what they did wrong, same for me.

"There are still a lot of games to be played, plus three games against Celtic.

"We have to move on, get stronger and make sure the moments we had here never happen again, no matter who we play."