O'Neill has made no secret of his desire to one day play outside of the A-League and test himself at Europe.

After three impressive seasons with the Sky Blues, the 24-year-old has less than six months left to run on his current deal.

According to recent reports, Aston Villa, QPR and Rangers are among those interested in luring the talented Australian to the UK.

O'Neill is weighing up whether to leave Sydney FC at the end of the 2018/2019 season after winning four trophies with the club.

"I have aspirations, like anyone else in Australia, to play at the highest level and overseas," he told FTBL.

"Both myself and Sydney FC, and as a club they’ve been brilliant in terms of talking about that and they realize that’s what I want to do. But they also want to support me and help me as much as possible.

"But maybe not yet – there’s still a lot of football to be played, a lot of scenarios to play out.

"The biggest thing for me is I have the support of the club, I have the support of my family and friends that I will make the correct decision moving forward that ultimately helps me achieve what I want to achieve and where I want to play.

"It’s a good position to be in because lads that have been in this situation don’t have the support and the actual guidance to make the right decision, and it is a big decision because I’m 24 now.

"We’ve been so lucky to have the success we’ve had at Sydney FC and I feel that the next part of my career, and the next part of my life is trying to play at the highest level possible.

"Whatever the situation or the scenario that plays out, me and Sydney FC are committed to making sure the best outcome happens for club and player."