ijjysmith
Calm
Wales manager Chris Coleman has to make a decision between Sam Vokes, Jonny Williams and Hal Robson-Kanu - one of whom will partner Gareth Bale up front.
Northern Ireland boss Michael O'Neill could pick the same team for the match in Paris that played against both Ukraine and Germany.
The winners will play Hungary or Belgium in the quarter-finals.
Wales striker Vokes and defender Ben Davies are a yellow card away from suspension. For Northern Ireland, another yellow card for Craig Cathcart, Stuart Dallas, Jonny Evans or Jamie Ward would see them banned for a potential quarter-final.
The eagerly-anticipated clash between Wales and Northern Ireland is the first time two home nations have met in the knockout stages of a major tournament. It is also the first time either nation has made it to the knockout rounds of a major tournament since the 1958 World Cup.
Wales will be slight favourites after a performance against Russia that was lauded as one of the finest in their history. It was so good Coleman even allowed his players their first beer since they joined up a month ago.
Bale scored again in that game and his list of achievements and statistics at this tournament are already very impressive. Now Wales' all-time record scorer at major tournaments, he is the first player since Milan Baros and Ruud van Nistelrooy in 2004 to score in all three group games. But with Wales, it is always about the team.
Much like it is with Northern Ireland. Their path to the last 16 may have been more unusual than Wales', but their unorthodox style has been very effective indeed.
After the group stage, Michael O'Neill's side finished bottom of the table for average possession (28% - Germany are top with 72%), total shots (17 - Portugal have had 70), most successful passes made (416 - Spain have completed 1871) and for passing accuracy in the final third (42% - Spain's figure is 83%), yet they stand 90 minutes away from a quarter-final against either Hungary or Belgium.
They could again be reliant on the performance of goalkeeper Michael McGovern. He was given a standing ovation when he walked in the dressing room after a man-of-the-match display against Germany that saw him compared by O'Neill to the great Pat Jennings. His saves helped his side protect a goal difference that ultimately meant they qualified as one of the four best third-place finishers.
