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Northern Ireland's manager, Michael O'Neill, has set his players the unenviable task of ensuring Cristiano Ronaldo's big day proves to be a damp squib in Porto. The Portugal captain will win his 100th cap and has unsurprisingly dominated the build-up, from the posters bearing his face around the city to the majority of questions at every media briefing.

Asked what he expects Ronaldo to produce during the game, O'Neill said: "Hopefully very little. I would be happy if he has a really poor game and he is remembered for having a bad night on his 100th cap.

It is irrelevant to me that it is his 100th game. It is, of course, a great occasion for the player but it is not a concern for us at all. The best hope for us is that the work we have put in is put into practice in the game. We have to recognise the quality of the opposition but we are not sitting here just hoping for Ronaldo to have an off night. We have trained to this level in preparation. It is our job to make sure they do have an off night and we can add to them having a frustrating night by taking our opportunity when it presents itself."