He played and was one of the star player for some of the top teams in Europe but it's reported that he insisted in having a clause in his Juventus contract that he be released for all international games. Although he probably would have been released without the clause you still have to admire that.
Maybe some people's dislike for him if for his poor management of Celtic?
Also a few people have posted on here about seeing him crack open a bottle of champers straight after Ireland had lost an important qualifier and that he comes across as a bit arrogant. Up to then he was and sill is (arguably) the most successful Irish player of all time, so I suppose he should be allowed to be a bit arrogant.
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