The Reading midfielder headed the winner in Wales' 2-1 victory over Scotland on Friday night - his first international goal - and he says the result has given the squad confidence ahead of the Croatia showdown.
"It gives everyone a big lift," Robson-Kanu told Wales Online. "You get a big win like this in international football and it changes the picture in a big way, everyone takes confidence from it, from us as players to the fans.
"But we won't stop now. We're going to look to beat Croatia, we're going to give it a shot and if we set out as a team and show what we're about again then we'll get a result.
"Hopefully I showed I've got something to offer this side. I've been pleased with my performances for Reading all season really, I know what I can do and days like that one is when you have the chance to show it and hopefully I've done that.
"It's a proud moment to get my first goal, especially in the context that I did. It's a massive three points that helps us look forward and we'll go into the game with Croatia full of confidence and looking to do the same."