Ireland flank Chris Henry has had an operation to repair a defect on his heart wall after a temporary blockage was discovered in a small blood vessel in his brain.
The defect was found to be related to the blockage, which was discovered before Ireland’s victory over South Africa on 8 November.
Henry was withdrawn from the starting lineup on the morning of the South Africa match with a suspected viral illness that was initially diagnosed as a severe migraine.
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Henry is recovering from the operation, a statement from the Irish Rugby Union said.
The chief executive of Henry’s club side Ulster, Shane Logan, was quoted as saying that the province was: “more optimistic than we were a week or two ago” about him making a return to professional rugby.