Ulster player had struggled with a hip injury over the last few seasons
He earned 56 caps for Ireland, the last of which in 2019.
“This decision has taken a considerable amount of time, it has been one of the hardest I’ve ever had to make,” said McGrath in a statement. “The last few years have been extremely testing for myself and my family, both mentally and physically. “I feel I have given everything to my rugby career and I have no regrets or anything left to prove. It’s been a long road of rehabilitation after two hip resurfacing operations.“I am in a position now where I have a comfortable, pain-free life and can be an active dad, which I have chosen over going back to play rugby.”
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