Delap had an excellent late run of form last season, but Mick McCarthy decided to stick with the players who had got the country through the most qualifiers.
While there's nothing in the FIFA rules about players going home in the huff, they do state that no replacements can be called up except in the case of serious injury.
My sympathies lie not only with Delap but with the ROI whose World Cup hopes have been cast into doubt because of the immaturity of two individuals.