Odds are its just stress diarrhea. You've only had him home for around twenty-four hours or so you said? I don't think I would worry too much unless it persists. If he has never had chicken before that could also be a bit upsetting to his stomach, but I think (someone correct me if they think I am wrong) that it is probably stress.
Take him to the vet if you think you should, has he had his shots?
Good luck with him