FOOTBALL - Click Read More to see some key facts concerning Tuesday’s World Cup qualifier between Portugal and Northern Ireland.
> Cristiano Ronaldo will play his 100th international match for Portugal. He made his debut for Portugal on 20 August 2003 in a 1-0 friendly victory over Kazakhstan.
> Cristiano Ronaldo becomes the third Portuguese player to amass 100 caps, behind Luis Figo (127) and Fernando Couto (110).
> Ronaldo becomes the third youngest European player to reach the century at 27 years and 254 days of age, following Germany’s Lukas Podolski (27-013) and Estonia’s Kristen Viikmäe (27-109).
> In 11 previous international matches between these two, on only two occasions one of these two teams managed to score more than one goal.
> The last time Portugal were defeated by Northern Ireland was in a World Cup qualifier more than 30 years ago. On 29 April 1981, Portugal lost 1-0 in Northern Ireland.