Christian Cullen has decided to retire from the sport with immediate effect.
The New Zealand full-back, who played his last game for Munster last month, said injury problems were the main reason for his decision.
"I've hung up the boots for good," he said. "My mind is fresh and feels like I could sign another four-year deal.
"But there comes a time when you have to be a realist and I know my body has had enough. I can't remember the last time my ankles and knees didn't ache."
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