The Chelsea defender told the 'London Evening Standard': ''The Belgium game was a reminder to us of the standard of teams we are coming up against from now on.''
''No disrespect to Panama, but that was a different test. They way they [Belgium] moved positions and kept the ball - it was a good benchmark for what is to come.''
''We made eight changes, nine if you include the substitution at half-time. Things were always going to be a little bit disjointed. It doesn't derail us. I won't affect our momentum. It was disappointing to lose the game, but we have lost nothing.''
As for their upcoming last 16 clash with Colombia, Cahill said: ''Colombia are a very good side, but it's all ifs and buts isn't it? It's going to be difficult, but they will all be.''
He added: ''It's like any competition. The longer you stay in it, the less likely you're going to dodge any big teams.''