Phil Jagielka believes that a consistent stint as an Everton centre-back has made his England call-up possible.
At his previous club Sheffield United, Jagielka often swapped between centre-half and a central midfield role but since moving to Merseyside he has settled into a defensive partnership with fellow England hopeful Joleon Lescott.
If the 26-year-old is to establish himself as a world-class player, he thinks he must make his mark on one position.
"Obviously when you are coming through the game you just want to play in whatever position is available," Jagielka told The FA's official website.
"But to establish yourself at the top level you have to be less a jack of all trades and more a master of one.
"I will still play in other positions but I am happy that I have been able to have a consistent run as a centre-half."
Jagielka's only England cap came off the bench against Trinidad and Tobago last year.
"My debut in Trinidad was a brilliant moment," he added.
"It wasn't just five minutes either. To get half a game was fantastic and something I've always wanted to do.
"I was happy enough the season before to earn an England 'B' cap so going one better the following season was fantastic."
His second call-up is against much more formidable opposition as England take on European champions Spain on Wednesday night.