With his wife and family all based in Sydney, "JP" made the decision to return to NSW following May's Grand Final win over the Newcastle Jets.

In his four seasons at AAMI Park, Victory qualified for three Grand Finals, secured two Championship wins and also won a Premiers Plate.

It's a return to his roots for the former Socceroo who began his coaching career in the heart of Western Sydney, managing Marconi Stallions.

He then had stints with Sydney United, Newcastle Jets, Melbourne Victory and the Australian U17s.

De Marigny said he was looking forward to working with new coach Markus Babbel and bringing success to Western Sydney.

“I’m very excited, I spent a lot of time in Western Sydney both coaching and playing so it’s a real homecoming,” he said.

“Obviously, my family is here, so it’s been a long journey to get here but it has been all worth it. 

“Western Sydney is a unique area and it’s a hard-working class area. There’s a lot of honesty in their work and values are very important to them.

“It’s all about bringing my knowledge, knowing the football landscape and understanding the formula for success into the football club and helping Markus Babbel to achieve what he wants to achieve at the club. 

“That’s how I see my role and if we are going to do something – we are going to do it properly. We want to be the best at it, so hard-work and bringing belief to the group and doing things with honesty and aggression, while being humble whilst achieving these things.

“Personally, it’s a great opportunity to work next to someone such as Markus that has a massive profile in football.

“I’m looking forward to learning as much as possible and I can’t wait to work with him.”

Meanwhile Victory coach Kevin Muscat paid tribute to his former assistant.

"JP has been a very popular member of our football club for a number of years now," Muscat said.

"It's obviously sad to see him go but we wish him and his family all the best for the future.

"We're currently talking to a number of candidates about the role and we're hoping to have someone in place early in pre-season."

De Marigny was said to be in the running for the Wellington Phoenix job which eventually went to Mark Rudan.

"I've really enjoyed my time in Melbourne and winning those two Grand Finals, each under very different circumstances, has certainly been the highlight," de Marigny said.

"It's been terrific to be part of the club's success over the past five years and I wish Kevin and everyone else at the club the best of luck in the future."

De Marigny, along with Victory's goalkeeping coach Dean Anastasiadis, had a turbulent end to the 2017/18 campaign - both banned from taking the bench during the A-League Grand Final after entering the pitch in the semi-final against Sydney FC and clashing with player David Carney.