Mick McCarthy said any Danish spies at the Parken Stadium were wasting their time watching the Republic of Ireland's final training session before their crunch Euro 2020 showdown tonight. 

The boss kept things simple on the eve of the match - "21 players running about passing the ball to each other trying to score" - amid fears there were opposition eyes around looking to glean clues about how the visitors will set up. 

"I haven't got something up my sleeve tonight," McCarthy said ahead of his final training session on Thursday evening.

"I am going to do nothing that has anything to do with the game. We'll have 21 players running about passing the ball to each other trying to score. 

"It's nuts. They all say they have cleared the stadium but I don't think for one minute there is ever a game where they have cleared the stadium without somebody watching, so why would you do it in the stadium anyway?"

This fixture has developed into something of a grudge match in recent years. The sides have drawn three of their last four meetings but its Denmark's 5-1 hammering of Ireland at the Aviva Stadium in the World Cup play-off that sticks in the minds.

McCarthy was on the end of a Danish drubbing himself as a player, the 4-1 loss at Lansdowne Road back in 1985, 

"We are playing against a very good Danish team. It's up to us to put on a performance and see how about the result afterwards," he said.

"They're just a good team. Lots of teams have that one special player and (Christian) Eriksen can produce something not having done anything throughout the game; he can find a goal, a pass, a cross, a free-kick.

"It was like playing against the Red Arrows in the second half," he added of the 1085 clash.

"They were an excellent team. We didn't scratch the surface in that game. It was my competitive debut at international level.

"I'll want a better result than that of course."

Follow Denmark v Ireland via our live blog on RTÉ.ie/sport and the News Now app. Watch the match live on RTÉ2 or listen to national radio commentary on RTÉ 2fm's Game On.