a footballer is obliged to wear the teams kit and nothing else. It should not be compulsary for him to have yo wear a poppy. On foreign players, the gesture is pretty pointless anyway.
Saying that, I do not accept his reason for not wearing it. Northern Ireland is in the UK, and many of his countrymen died in the wars. It is disrespect to those people.
The British Army may not have had a good day on Bloody Sunday, but that was over 40 years ago. This footballer was born long after that day, and was born into a hard fought peace. I don't think his explanation for mot wearing it holds up.