Andrew Trimble, Donncha O'Callaghan, Martin Moore and Roger Wilson have all been added to the Ireland squad for the autumn international series.
Coach Joe Schmidt has mixed news on the injury front ahead of Tests against Samoa, Australia and New Zealand
Brian O'Driscoll is expected to train fully this week after recovering from a calf injury and Mike Ross has completed his rehab from a hamstring injury and is expected to train tomorrow.
However, Paul O'Connell (calf), Keith Earls (knee) and Cian Healy (knee) will not train this week.
Rory Best has an ankle strain but is expected to train later this week while Sean O'Brien will return to training on Thursday.
Robbie Henshaw and Declan Fitzpatrick are also carrying injuries.