Gloucester have won all three encounters, but all three games were hard fought affairs and the Stoke on Trent born half back knows that Saturday will be equally as tough.
"The previous results will give us a bit of confidence, winning against a team will do that for you.
"But, Saturday is a massive game for us and we can't take anything for granted against Irish.
"They're in a relegation scrap and they're going to be fighting for their lives. So, we know that we're going to have to come out and perform in what will be a massive game for us.
The 20 year old, who has represented his country in two Junior World Championships, has been a regular in the matchday squad this season and is delighted with how things are progressing for the team and for himself.
"It's been good. I was told earlier this week that I've been involved 16 times this season, which I'm really happy with.
"As a team, it's been going really well. We wanted to be top four by Christmas and we've done that, so we've just got to keep the momentum going."
Gloucester are looking to get back to winning ways after losing 17-12 at Leicester last weekend.
The Cherry and Whites could have snatched a win in the closing stages, and Robson stressed that being disappointed in only picking up a losing bonus point at Welford Road shows how far the team has come this season.
"It shows how much we've come on as a team. As a group of players, we just want to keep playing well.
"We're slightly disappointed to come away with the loss on Saturday, but we know that we had chances to tie it up or even win it at the end, so we're positive and we'll take that into Saturday."