The defender, 21, spent the season on loan with Steve McClaren's Dutch-title winners FC Twente.
And he said: "I was pleasantly surprised that I found myself among the 30 players.
"Honestly, I did not expect at the start of the season that I would experience this stunning finish. The title with Twente, and the success of Chelsea... and the fact that I would work with Antic and the Serbian team.
"I consider that a success whether I get to go to the World Cup or not.
"I have not worked with Antic yet but I have a great desire to show him that his selection was right. I am completely ready. I have played enough this season to be in good form."