The Suns went down to the Eagles by 37-points at Patersons Stadium.
“I think with any young group we’re going to experience that, and that’s our greatest challenge,” McKenna said.
“We spoke about it before coming out to train. We had a good start, now what would make it a poor start is if we leave it all behind in Greater Western Sydney.
“Everyone sits back and probably like most of the season they’re going to give us no chance. Well we’re happy with that.
“If we stick to our structure and stick with some intensity, I think we give ourselves a good chance, as we showed last week,” he told the AFL website.
The Suns are likely to be missing skipper Gary Ablett until their round two clash with Carlton; their debut in the AFL. And Gary’s brother Nathan is likely to get some match time over the coming two weeks after a hamstring strain.