Luke Fitzgerald is likely to find out today the extent of a knee injury which forced him to retire in the 27-3 opening-night RaboDirect Pro12 League loss to Ospreys.
The 23-year-old, playing at inside centre, saw his return to competitive action on Friday after being left out of Ireland's World Cup squad cut short during a dismal affair for the Heineken Cup champions.
Leinster also lost prop Jamie Hagan, who produced a fine display on his return to the province after his stint in Connacht, to injury.
Fitzgerald is the biggest worry for coach Joe Schmidt, who is trying to deal with 14 players being away in New Zealand with Ireland.
A scan is expected to reveal the extent of the knee injury to Fitzgerald as Leinster bid to bounce back from the Ospreys defeat against the Dragons at the RDS on Friday.
Leinster were blown away in the opening half when the Ospreys scored three converted tries at the Liberty Stadium. They improved after the restart, but made no inroads during a scoreless and dour second period, leaving Schmidt in no doubt about the battle ahead in the coming weeks.
"This was a bit of a reality check and not something you want to get. But, in the growth of young players, we can use it as a bit of a baseline to work up from."