Joey Carbery's injury status is expected to be made clearer today.
Carbery, 23, suffered an ankle injury in last Saturday's opening World Cup warm-up win against Italy at the Aviva Stadium.
Afterwards Ireland head coach Joe Schmidt confirmed that the Munster out-half had not suffered a fracture.
But there are still concerns over Carbery's fitness ahead of Ireland's trip to the Algarve tomorrow for the start of an eight-day training camp.
An update on Carbery, and on whether any more players have been released from the 41-strong provisional squad, is due today.
Ireland face England - who named their World Cup squad yesterday - at Twickenham on Saturday week, before back to back clashes with Wales to round off the warm-up series.
“There’ll definitely be a number of changes," Schmidt said.
"I’m not sure there will be 15 but I’d say 10 will be a good starting point - and it could be more.
“It'll depend a little bit on how guys come through this. Potentially what we want is to see more of guys.
"If we’ve already made our decision on someone they might just go Wales, Wales and in (to the final squad for Japan)."
