Genia said that while he will not have a direct battle with Phillips, he expects whoever plays better on the day to have a big impact on the match.
"He's an exceptional player," Genia told Sky Sports News. "He's a physical, abrasive character. He likes to get stuck in.
"As far as individual battles go, you very rarely as half-backs come into contact with each other.
"There's no real one-on-one opportunities with each other, it's more just doing as well as you can for your team and having a positive influence, rather than trying to do too much and outdo the other bloke."
The game kicks off at 11.05am on Saturday.