An emotional Luke Shaw has admitted he was stunned to hear about his first England call-up.
The Southampton left-back was named on Thursday in a 30-man squad for next week's friendly against Denmark at Wembley as Roy Hodgson steps up his World Cup preparations.
The 18-year-old only made his first Premier League start in November 2012, but impressive performances since had made him a serious contender for Brazil.
"It's a very proud day for me, I still cannot believe it," Shaw told Southampton's website.
"I'm only 18. I cannot believe it. I am really excited. It's a massive confidence boost for me.
"Roy rang me this morning and told me I was in the senior team, and that I was there on merit.
"I wasn't expecting it. I didn't know what to say."
Shaw, who came through the famed Southampton youth academy before he was fast-tracked into the first team by former manager Nigel Adkins, had only been expecting a call from the Under-21s.
"I saw (speculation about a senior call-up) on Twitter over the past month but I tried to ignore it," he added.
"I was always thinking I was going to be called up to the U21 squad but to get a senior one is unbelievable."
With Ashley Cole currently relegated to the Chelsea bench, Shaw stands a reasonable chance of being included alongside Everton left-back Leighton Baines in Hodgson's 23-man World Cup squad.
But when asked whether thoughts of playing in Brazil this summer had crossed his mind, Shaw said: "No, nothing.
"There is a friendly and hopefully I will get some game time and keep up the performances I have been having at Southampton and then who knows what will happen."