This will be Portugal’s fourth semi-final in the last five editions of the competition stretching back to 2000, but for all their success in reaching the latter stages of the tournament, there has been little glory along the way.
Only once have they overcome the last-four hurdle and then they were beaten in the final by Greece as hosts at Euro 2004.
If you include their defeat in the semi-finals of the 2006 World Cup and a loss at the Euros in 1984, they are becoming all too familiar with the pitfalls of this stage of major tournaments.
Portugal’s conquerors in their recent last-four clashes have included football powerhouses France, at Euro 2000 and the World Cup in 2006, and Spain at Euro 2012.
Should they lose to Wales, playing their first major tournament in 58 years and their first ever semi-final, it would be a devastating blow.
Yet Wales are arguably the form team coming into the match.
Chris Coleman’s side have revelled in their underdog status to win their group, which also included England, Russia and Slovakia, ease out British rivals Northern Ireland in the last 16 and sweep past heavy favourites Belgium in the quarters.
Portugal are yet to win a match at the tournament inside 90 minutes, having drawn all three group games, beaten Croatia in extra time and squeezed past Poland on penalties.