Silva, 36, intends to be fully fit and in shape for the Qatar tournament.
He told the club's website: "Yes. First, I have this ambition to continue producing good performances here at Chelsea. I chose this club to keep playing at a very, very high level. Of course my ambition is to keep working hard to play at the next World Cup. It will be a World Cup very special, different to all the others.
"I hope to have the possibility of going there, but for now I have to keep working at this level and continue winning qualifying matches for the Selecao to even qualify for the World Cup! People talk about the World Cup this, the World Cup that, but first you have to qualify.
"That's my main ambition, to continue playing with my team-mates and winning matches to qualify and then, of course, prepare ourselves and try to bring back the big trophy to Brazil."