Rhys Ruddock: Ireland flanker tears hamstring in Leinster victory
Ireland flanker Rhys Ruddock could miss the start of the Six Nations after tearing a hamstring in Leinster's win over Exeter on Sunday.
Leinster scrum coach John Fogarty said on Tuesday that the initial assessments on Ruddock's injury "aren't great".
"He's not going to be involved this week or the next week or the next week," said Fogarty.
Leinster had better news on Johnny Sexton who resumed training after straining a quad muscle on Sunday.
"He did pick up a slight knock but nothing to concern us too much," added Fogarty of Sexton.
However, Fogarty was downbeat about Ruddock's prospects of featuring in the coming weeks.
"It's a hamstring injury. He's going to see a specialist, which isn't a great sign either, this week and the time-frame will become clearer then.
"It's a tough blow for us. He was very important for Ireland in November and obviously for us, when you play a team like Exeter, you need big bodies."
Ruddock, the son of former Wales coach Mike Ruddock, played in all three of Ireland's game in November which brought his caps total up to 19 and scored a try in the record 38-3 win over South Africa.
Ireland begin their Six Nations campaign with an away game against France on 3 February.