The Three Lions will take on their first Group D encounter in Manaus on June 14, but will play three warm-up matches beforehand, the first of which is against Peru at Wembley tomorrow.
When asked in Thursday's press conference how near he is to picking his starting XI, Hodgson said: "Not that near, simply because the performances of the players in training has been so good.
"They have been so keen to stake their claim so I have to admit it's not going to be an easy choice. There are a lot of positions around those senior players that need resolving."
England will also face Uruguay and Costa Rica in the group phase.