Caulker is proud his form has been recognised by coach Roy Hodgson.
"This is a massive opportunity and a massive moment for me," he told the Spurs website.
"There are so many good centre-halves in England so to get called up into the senior side like this is brilliant and a great chance to hopefully learn and progress.
"Naturally it is a break that I must ensure I take full advantage of so I’m working hard in training and hoping for some game time.
"I know I’m young and I’m still learning but I am determined not to rest on my one cap so every call-up, every training camp takes me closer to that dream."