Sydney FC are unsurpisingly keen for O'Neill to stay with them next season.

The central midfielder has missed just three A-League games in the past two and a half campaigns.

Asensio's Screamer Vs FC Barcelona
Asensio's Screamer Vs FC Barcelona
In one of Real Madrid's most outstanding performances at the Camp Nou, Los Blancos beat FC Barcelona 3-1 in the Spanish Supercup. Real were leading 2-1 after Cristiano Ronaldo's 80th minute goal, but just before the final whistle, we sealed the win with this beautiful Marco Asensio strike.
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"Brandon is a fantastic asset for our club and has been instrumental in the club's success these last few seasons," Club CEO Danny Townsend said.

"We will be doing everything we can to keep him at Sydney FC."

O'Neill has been transformed as a player after arriving at the Sky Blues in 2015 from Perth Glory searching for regular game-time.

The West Australian found it at Allianz Stadium, thriving under the coaching of Graham Arnold and becoming an integral part of the side that won two premierships, a grand final and an FFA Cup.

The 24-year-old remains indebted to Sydney FC.

"I’ve said this to so many people but Sydney is my footballing home and forever will be," he said.

"I was born in Perth and raised in Perth, and my family and friends are still over there, but in terms of my career and what’s happen in the four years I’ve been here this will forever be my home.

"I’d love to travel and see a bit of the world and then finish my football career here because it’s the best club in the A-League, it’s the best club in Australia to be part of and I have no intention of ever playing for any other A-League club because of what they’ve offered me and what I’ve been able to do here.

"It’s a big decision that I’ve got to make this year… I’ll make sure I’ll make the right one and everyone will be happy."