Ireland have announced that Fergus McFadden has joined the squad as injury cover ahead of their Six Nations clash with France on Saturday.
McFadden arrived at Carton House on a day when Simon Zebo (knee), Andrew Trimble and Johnny Sexton (both shoulder) all sat out training.
In good news, flankers Sean O'Brien and Tommy O'Donnell both took part in Tuesday's session, with the former back from a hamstring injury.
"Tommy O'Donnell has completed his HIA; he trained today fully. Sean O'Brien trained today fully. Rob Kearney took a part in training and is being assessed by the medical team. He should train fully on Thursday. Today he got through a volume of work and will be ready to go on Thursday," said Ireland assistant coach Richie Murphy at a press conference.
"Keith (Earls) is going through HIA 1 and had passed that but he is in that sort of process where he is working through those protocols at the moment. He feels pretty good himself but with a six-day turnaround we will just have to assess that later on in the week and see where he is at."
Murphy added: "We are squeezed for time but no player is going to be ruled out (yet). We will be picking the best team to go to war with France at the weekend. Keith is not ruled out at the moment. He is in the middle of that return to play protocol so we will just see how he progresses over the next few days. It is a little bit unique to push selection back a little, to see who is fit and healthy, and who is ready to go.
"All those players who played at the weekend have come back to camp, Rob Herring, Paddy Jackson, Stuart McCloskey, all returned fit and healthy.
"Mike Ross and Cian Healy are still with Leinster and seem to be progressing well. I think both of them are available for their game (against Zebre) on Friday night. They are not in the Ireland squad at the moment."