It looks like Ireland will be without Horgan, McFadden and Flannery for the tour.
Horgan was a late withdrawal from Ireland 29-23 defeat to a stomach bug that saw him heading to hospital instead.
McFadden has a broken jaw which will require surgery and a six to eight week recovery.
Flannery
Jerry Flannery will sit out the rest of the Six Nations after receiving a six-week ban for kicking Alexis Palisson in the France game and being cited afterwards.
Flannery pleaded guilty and can resume training on March 29 (9 days after Irelands final game against Scotland)
Flannery has the rig
Declan Kidney feels he has selected the team with the right balance to play Argentina at Croke Park.
Geordan Murphy, Jerry Flannery and Stephen Ferris are all drafted back in for the crunch match to ensure Ireland end up in the pool they want for the World Cup Draw.
Commenting on the challenge
Jerry Flannery's prospects of playing in the Six Nations improved dramatically when an ERC (European Rugby Cup Ltd.) Appeal Committee ruled in his favour at the Dublin hearing earlier today.
The Appeal Committee found that Flannery had stamped on Julien Bonnaire recklessly rather than deliberatel
Munster Rugby announced on Wednesday that they have lodged an appeal with ERC (European Rugby Cup) against the decision handed down by the independent Disciplinary Committee for the alleged stamping by Jerry Flannery in the recent Heineken Cup defeat to Clermont Auvergne.
Jerry Flannery will miss this season's RBS 6 Nations campaign after receiving an eight week ban!
Flannery was cited after appearing to stamp on Julien Bonnaire in the Munster Heineken Cup defeat by Clermon Auvergne on 13 January.
Flannery's suspension lapses on 19 March - four days after Irela