Gary Speed's Wales welcome old rivals England to the Millennium Stadium for an eagerly-anticipated Euro 2012 qualifier looking to upset the odds against Fabio Capello's troops.
Swansea defender Williams, who captained Wales in their last two Euro 2012 qualifiers against Bulgaria and Switzerland, is looking forward to pitting his wits against England's array of stars. Manchester United star Rooney and Liverpool hit-man Carroll are expected to lead the attack for England, meaning Williams will have the task of snuffing out their threat if Wales are to cause a shock against England.
"I have played against Carroll before when he was at Newcastle and he is a right handful," Williams told skysports.com. "I have never played against Wayne Rooney, but everyone knows about the quality of Wayne Rooney and those two will be a big danger for us on Saturday. "I will look forward to coming up against them as you always want to play against the best players. Hopefully we can keep them quiet by doing a job on them and that will only help our chances of getting a good result."
Williams admits Saturday's showdown will be the biggest game of his career as he prepares to play in front of a packed house at the Millennium Stadium. "It will definitely be the biggest game of my career so far and I think it will be the same for a lot of the players in our squad," added Williams.
"There is no pressure on us as England are expected to win. We have nothing to lose and we will be giving it a right go to get a win. I have never played at a full Millennium Stadium and I am sure it will be a great atmosphere. I have seen the atmosphere there for rugby games and I am excited about playing in front of such a big crowd and hopefully they can spur on us. Hopefully we can put on a performance and get a bit of pride back after a disappointing start to our qualifying campaign."
Williams believes Wales possess the players that can hurt England with Speed having most of his top stars available after they missed last month's defeat to Republic of Ireland. "The mood in the camp is good," added Williams. "The manager has changed a few things and we are quite happy with how things are going.
"For the first time in a long time we have got our best players available like Bale, Bellamy, Ramsey and Ledley and with a fully-fit squad we can be a match for anyone on our day."