Plenty of his team mates took to Twitter to congratulate the 23-year-old on his call-up, including Adam Le Fondre, Hope Akpan, Jem Karacan, Nicky Shorey and Hal Robson-Kanu.
After the England squad for friendlies against Ireland and Brazil was announced, McCarthy spoke to Sky Sports and said, "I am over the moon to get the call. Growing up as a young boy, you dream of playing for your country. I have got that opportunity now."
There was also an overwhelming response on Twitter and Facebook for Alex from our supporters..
The Royals shot stopper also took to the social network website to thank the supporters, while England boss Roy Hogdson had his say on Alex's call up - click here
to read that.