England play a friendly against Denmark in March before Roy Hodgson names his provisional 30-man squad for the World Cup on 13 May.
The competition for places in midfield looks particularly fierce, but the Arsenal midfielder knows that he has to keep his head down if he is to be certain of his ticket to Brazil.
"That is where you are going to get into the England World Cup squad - by playing well for your club, then you are going to get picked for your country," Wilshere said.
"You have seen over the last couple of months that the talent there is, even in the Under-21s, with Ravel Morrison and all these players coming through. You are never guaranteed and cannot rest on your laurels.
"You are only as good as your last game, they say, so when the time comes, I have to be on top form and there will be a lot of players looking to be as well.
"At club level, there are a lot of games, so we are not thinking about the World Cup at the moment.
"Once March comes, the World Cup will be just around the corner and then it will be fresh in our minds."
You can see who England will face in Brazil next summer when the draw for the World Cup is shown on Sky Sports News on 6 December.