Ireland are monitoring the fitness of full-back Rob Kearney ahead of Saturday's Six Nations contest against Italy in Dublin.
The full-back is nursing a hamstring strain and is a doubt to face the Azzurri at the Aviva Stadium.
Kearney was absent for Ireland's opening 16-16 draw against Wales, but returned to play in the defeats against France and England.
Eoin Reddan also missed training on Tuesday due to a calf complaint, but Tommy O'Donnell took part as he recovers from a shoulder problem.
"Rob Kearney had a slight hamstring issue so he sat out training," Ireland scrum coach Greg Feek said.
"Tommy O'Donnell trained fully today so he's good. Eoin Reddan had a calf issue so he sat out training as well.
"We'll wait until Thursday to assess Kearney and Reddan."