O'Neill joined the Sky Blues on a two-year deal in 2015 from Perth Glory. The midfielder has been a regular for Graham Arnold's side this season.

O'Neill told FourFourTwo he hasn't been thinking about next season.

"Not really to be honest, I haven’t really thought about it," he admitted.

"All I’ve been thinking about is each game and being able to bring success to Sydney FC. I’m sure if we can have a very successful year as a team and as a club then everything will sort itself out."

O'Neill has thrived in central midfielder alongside Josh Brilliante. Sydney FC are on top of the A-League table and remain undefeated after nine matches.

"It’s just enjoyable," the 22-year old said.

"I’m enjoying my football and working under a master coach in Graham Arnold and I’m playing alongside some very top players. Not only top players but very kind and humble individuals. The way things are set up for this season I’ve been able to kick on.

"But I still believe there’s a lot of improvement left in my game. There’s weaknesses in my game I need to improve on and I have to improve on to be able to play week in and week out for a team like Sydney FC."

O'Neill's agent Tony Rallis said he is in talks with Sydney FC about a new contract for the Perth product.

"Brandon is a quality player that has attracted the interest of a number of clubs across the A-League competition," he said.

"Having said that he is happy at Sydney FC and wants to stay, and we are in talks with the club about a new deal."

O'Neill has ambitions to play for the Socceroos and ply his trade in Europe one day, but believes he is best placed to develop at the Sky Blues.

"Of course, any young player coming through the ranks in the A-League would be lying if they said they didn't have any aspirations to play in the highest league possible, and I’m no different to them," he said.

"It’s always been a dream of mine to try and test myself in another country and another culture, in a different playing style. But at the moment I’m developing as best as I can under Graham Arnold and Andrew Clark.

"They’re not only getting the best out of me as a footballer but as a person learning my trade. I think I’m in the right environment to develop and continue to play as best football as I can. For the near future I’m loving life in Sydney, I’m with the league’s best coach, the league’s best team and the league’s best organisation in terms of facilities and infrastructure.

"So my main focus is with Sydney FC."