Zaha's performances this season, most notably in the Carling Cup quarter-final victory at Manchester United, saw the Ivory Coast-born Londoner rewarded with an England Under-21 debut against Belgium this month.
His display in the 4-0 win prompted England interim coach Stuart Pearce to urge Zaha to pledge his allegiance to his adopted country but the youngster is finding it difficult to commit.
"I've been thinking about it a lot," he said. "My family and I have been talking it over and over. I've not made a definite decision. It's hard but I'm going to have to make it sooner or later."