HARRY KEWELL has given an insight into Ange Postecoglou's coaching at Celtic, insisting that the Hoops boss is 'relentless'.

The Aussie has turned things around at Parkhead and now has Champions League football to look forward to this season.

Kewell was added to Postecoglou's coaching ranks this summer and he has thoroughly enjoyed working under the Hoops boss.

He told Fox: "Since I’ve been up there, it’s been fantastic – I’ve learned so much from him already. And I just want to take all that information and build on that and hopefully become a better coach.

“I think one, it’s his attitude. You know, I’ve always liked to work with people that are good people first and foremost. And that’s what he is – he’s actually a good person.

“And then comes his work attitude, his relentlessness, he wants to be able to be the best all the time, which I love. He’s never satisfied. He wants to keep pushing, not only himself and not only his team, but he wants to push for that next level. And I love being part of that.

“And to be able to kind of sit back – I know it sounds funny – but sitting back and taking it all in and learning.

"I’m used to talking a lot and running a lot of things, but to be able to take a step back and watch someone else put on training sessions, put on meetings, be able to come up with different ideas, and you’re able to just throw your idea out there. And whether you can challenge him or not, that’s the key for me to be able to learn and, and push myself against the best.”