Republic of Ireland won their last home fixture against Denmark, though it was in a friendly back in March 2002 (3-0).
The Green Army have failed to win either of their last two competitive home fixtures against Denmark, losing 1-4 in a 1986 World Cup qualifier, and drawing 1-1 in a 1994 World Cup qualifier.
Denmark are unbeaten in five international away matches (W3 D2), since a 2-3 defeat in Poland in October 2016.
Republic of Ireland have lost just one of their 11 competitive home matches under Martin O'Neill (W6 D4), a 0-1 defeat against Serbia in September.
The Boys in Green have kept a clean sheet in their last three matches - they've not gone four competitive internationals without conceding since November 2001, which included a World Cup play-off game from the last time they qualified for the tournament (v Iran).
Christian Eriksen has been directly involved in 55% of Denmark's goals in this qualifying campaign, scoring eight goals and assisting three (both team-high figures).
Including the first legs of the play-off games, Eriksen has created more chances than any other European player during this qualifying campaign (38).
No Ireland player made more passes in the first leg than goalkeeper Darren Randolph (31).