Wales are hoping to book their place at a World Cup finals for the first time in 64 years with victory over Ukraine this evening.
Whoever wins will qualify for this winter's tournament in Qatar.
The match - which was due to be played at the end of March - was postponed after Russia's invasion of Ukraine.
Kick off in Cardiff is at 5pm.
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Northern Ireland get their Nations League campaign underway this evening.
They are away to Cyprus with kick off in their League C clash is at 5pm.
In League A, two games kick off at 7:45pm.
Spain travel to the Czech Republic while Portugal play host to Switzerland.