Leinster say that Jack Conan is facing an eight-week lay-off after undergoing his ankle operation.
The back-row has one Ireland cap and the injury was sustained in a pre-season match against Gloucester.
With the European Champions Cup starting on the weekend of October 14th, the recovery timescale means Conan is likely to miss the first pool fixtures.
Second-row Ian Nagle is also sidelined for at least another two weeks with shoulder injury, but Dave Kearney and Isa Nacewa have both returned to full training this week.
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