Brian O'Driscoll has been listed as no better than "50-50" to make the Heineken Cup final by Leinster coach Joe Schmidt.
"It is just the timeframe. We just don't have a lot of time. I think another day or two I would be 80% sure. That is the nature of it. We just don't have that time," said Schmidt this morning.
There has been strong speculation that O'Driscoll was removed from a training practice in a brace last week for assessment by surgeon Ray Moran, where the diagnosis was not as bad as first feared.
Reserve outside centre Eoin O'Malley is also thought to be out of contention with a calf injury. However, Schmidt is "very confident" Rob Kearney will be able to recover from a back injury to line out at full-back.
3SEE PAGES 58-59
JOHN O'Shea's injury is "nothing to worry about" according to the FAI and he will arrive in Dublin in a week's time as scheduled.
The Sunderland defender limped out of the final day drama at the Stadium of Light just before half-time.
However, tests done on O'Shea's calf and ankle found no ligament damage and FAI medic Alan Byrne, after contact with both Sunderland and the player, is happy the injury is a minor one.
Trapattoni's other injury concern Darron Gibson played a full part in Everton's 3-1 win over Newcastle.