After two defeats to start the season, Wagner admits they must do all they can to get off the mark at home to Cardiff on Saturday and urged the home fans to play their part.
"Our supporters know we have the highest ambitions we can have. They know they play a big, big part for us. We will always be ambitious and give ourselves no limits.
"We are focused on us and our work to do everything as good as we can. Then we want to bring this energy and intensity into the John Smith's Stadium.
"It's an important game on Saturday because it's our next one. It'll be a tough game but we have an opportunity to be successful. For that, though, we need to get everything right."