The 30-year-old was not included in Gli Azzurri's squad for a three-day training camp in Rome, despite being the third-highest scorer in Serie A this term with 18 goals.
"I am disappointed to have been excluded considering I've had a good season," said Miccoli. "But what can I do but be patient.
"It will mean that during the World Cup I will get to go to the beach with my family. But I wish Italy the best of luck in the tournament."
Miccoli has been a key figure in Palermo's bid to achieve UEFA Champions League football next season. The Sicilians lie fifth in Serie A, two points behind Sampdoria, who hold the last qualifying berth with two rounds remaining.
The former Juventus star has not featured for his country since a friendly against Finland in November 2004.