Garry Ringrose, the exciting young Leinster prospect, is training with the Ireland squad at Carton House.
Ringrose was not included in Joe Schmidt's original 35-man squad despite a bright start to the season with Leinster in the PRO12 and Champions Cup.
Picked out as a long-term replacement for Brian O'Driscoll in Ireland's midfield, the 21-year-old trained with the national squad on Wednesday.
Ireland the day before confirmed that Luke Fitzgerald will play no part in the Six Nations after bring ruled out for six to eight weeks through injury.
Ringrose's initial exclusion was well explained by Schmidt to the The 42.ie last month.
“Is putting him in against 110 kilos of hurtling Jamie Roberts or the 104 kilos of footwork and fend that Jonathan Davies can deliver, or is it sitting in the squad and not playing, or is it him building that confidence that he’s started to demonstrate through the PRO12 and one European start?” said Schmidt.
"This is a great window for him to get game time. It doesn’t mean we’re not investing in him.
"We’re investing in him because playing that PRO12 rugby is an opportunity for him to keep going.”