Group C and Group D both conclude today and one of the game's traditional giants could be heading for the exit door.
Essentially, France and Croatia are already through, Peru are already eliminated but everything else is potentially up in the air.
Here's a full rundown of the permutations.
Group C
France, on six points, top the group and have secured passage to the next round but will need a point against second-placed Denmark (four points) in their final match to clinch first place. Denmark could finish first, second or third.
A Denmark loss coupled with an Australia win over Peru, who have yet to earn a point, could see the Socceroos sneak through on goal difference. Since Denmark and Australia drew, they too could be split by fair play.
Australia, with three yellow cards, currently have the edge in this respect on the Danes, who have four.
Peru have been eliminated but will finish third with a win.
The winner of Group C will meet second place in Group D
Tuesday 26 June
Denmark v France (ko 3pm) Live on RTÉ 2
Jacqui Hurley is joined by Damien Duff, Didi Hamann & Michael O'Neill
Commentators George Hamilton & Ronnie Whelan
Australia v Peru (ko 3pm) Live on NewsNow & Player
Commentator Hugh Cahill
Group D
All sorts of outcomes are possible here with Croatia, on six points, through but the other three teams still in the hunt.
Croatia will top the group if they beat or draw with Iceland.
Nigeria, on three points, will secure their spot in the last 16 with a victory over Argentina, who sit bottom of the group on one point behind Iceland on goal difference.
A draw may also be enough for Nigeria even if Iceland beat Croatia, depending on goal difference.
To go through, Argentina need to beat Nigeria while hoping Iceland lose to or draw with Croatia. If Iceland and Argentina both win, to move to four points, they will be split by goal difference.
Iceland must win to have any chance but also need the other results to go their way.
The Group D winner will face the Group C runner-up.
Tuesday 26 June
Nigeria v Argentina (ko 7pm) Live on RTÉ 2
Commentators John Kenny and Brian Kerr
Darragh Maloney to be joined by Eamon Dunphy, Liam Brady and Richie Sadlier
Iceland v Croatia (ko 7pm) Live on NewsNow & Player
Commentator Adrian Eames
