"All that matters now is to stop talking about issues which are not about the next 11 games," Martinez said.
"All the individual issues, contract situations, what is going to happen, the World Cup influence - that is something we are not interested in."
He also warned players who may be thinking of Brazil they cannot afford to allow their levels to drop.
"Phil (Jagielka) is recovering well and we will make a really late decision on him to make sure he is fully fit for the remainder of the season," the Spaniard said.
"International commitments will be well looked after when the season ends so at this stage the World Cup does not come into any reckoning in terms of decisions.
"What is really matters is the last 33 points you play for so all the decisions are based on that.
"What you learn in football is the moment you want to protect yourself you lose your place in the team and that is going to affect the national team.
"It is straightforward. You need to focus on the games in front of you and finish in good form.
"There is still a good period until the World Cup starts and as a player it is just about narrowing the aims in front of you.
"The moment you start thinking a little bit further forward football can be cruel in that respect and you can end up with a negative aspect in your performance which is the last thing you want before a major tournament."
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