Our midfield maestro is expected to start for Wales in the eagerly-awaited friendly in front of a capacity 72,000 at the Millennium Stadium.
And while the 22-year-old hopes to get another taste of action in next weekend's Worthington Cup Final venue, he also knows a game against the best can only benefit a young Wales outfit long-term.
"It's a massive game for us," said Simon. "They are favourites for the World Cup in many people's eyes so it will be a great experience to play against them.
"They are playing England in the World Cup under a roof and they wanted to play British-style opposition in similar surroundings.
"There is no better place then the Millennium Stadium, it's magnificent.
"I played there with the roof on against Bulgaria and I can imagine it being amazing with a full house.
"Unfortunately, when we played that night, there was only 20,000 in there. With a full house all enclosed it will a great atmosphere."
For Simon and Wales, it's all about building for the European Championship qualifying campaign in September - they have to overcome Italy and Yugoslavia to reach Euro 2004.
He added: "You can only learn off the best and it will be a great experience for us going into our qualifying matches for the European Championships against the likes of Italy.
"The better teams we play against, the more prepared we'll be for those games. If I get a game I'll be delighted."
All eyes will be on Argentina but Simon Davies is desperate to upset the formbook when Wales take on the World Cup favourites in Cardiff tonight.