Trapattoni: Everton's Gibson asked to be omitted
Trapattoni said: "When Darron informed me of his decision to withdraw, I called him to talk things through.
"As we embark upon a brand new campaign, he is very much in my plans and I consider him to be a key player for Ireland for this campaign.
"However, Darron has said that although he doesn't want to let anyone down, he doesn't feel ready to ready to return to the squad for this fixture after the disappointment of Euro 2012.
"I hope that Darron will take this time to reflect positively on his international career, and return to us in time for the Germany game in October."