The Australian international has made an encouraging start to his claret and blue career with goals in friendlies against Burton Albion and Peterborough United.
"I don't know if it's the main dress rehearsal for us," Holman told Villa's website.
"Obviously it's the last friendly game for us. I think the manager will probably still want to try things out, which formations he actually wants to play against West Ham.
"Whether he's umming and aahing or doubting about which players are going to play there or there or wherever, that's obviously up to him.
"We'll see what happens, but it's definitely up to us to make up his mind and this game is a good chance for us to try to do that. It's only us as players that can do that, there's no other way.
"As long as I'm performing and giving it everything and pushing for the starting XI spot then that's all I can do."