The first Sydney Derby of the season takes place this week in Round 3 at Allianz Stadium - Sydney FC's home ground. 

However, Hamill believes the majority of the crowd will be supporting the Wanderers come Saturday night. 

"It's a home game for sure. (The Wanderers fans) are so passionate and so loud, even at other away games we hear them," Hamill said on Wednesday.

"It's pretty much 60 per cent red and 40 per cent blue whenever you go play at Allianz. 

"They're our 13th man, not our 12th but our 13th."

The Wanderers were the only team to defeat Sydney FC during the 2016/17 season, and Hamill believes that is still burning inside the Sky Blues. 

"It probably does (still hurt them). They probably still think they're invicible but they're not," the 25-year-old said. 

"It was good for us to make sure they didn't get that undefeated run. I don't think they deserved it."