Denmark, who finished second in Group E behind Poland, play host to the ROI for the first-leg at Telia Parken with both teams eyeing a place at the major event in Russia next year.
The Danes, who last appeared at the World Cup in 2010, are unbeaten in their previous nine outings whilst they have only lost one of their last 10 games on home soil.
Eriksen will be crucial in ensuring De Rod-Hvide pick up a victory on Saturday night and the Tottenham Hotspur midfielder has already been identifying which opposition players need to be watched.
"Yeah, McClean has played some really good games for the national team," he said. "They play defensively and have been very strong and compact, but you have good players in tough leagues, they know all about the intensity of the tough games, how to play in big matches, their strength so far have been set pieces."
Denmark have not beaten the Irish in the last four meetings with the most recent encounter back in 2007 ending in a 4-0 victory for The Boys in Green - Robbie Keane and Shane Long both bagging a brace.
However, Age Hareide's men are brimming with confidence ahead of the match and punters may decide to use their free bet on the hosts picking up a crucial win in the first-leg.