Sunderland manager Mick McCarthy has completed the signing of Colin Healy on a two-year deal.
The Republic of Ireland midfielder has become McCarthy's third summer signing after agreeing personal terms and passing a medical last week.
McCarthy said he was "thrilled" to have secured Healy's signature. "There was some strong competition for his signature, including from some Premiership clubs, so it's pleasing to have secured the services of a player of his quality.
"I know Colin well and I'm fully aware of his strengths. He'll be a great addition to our squad".
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Healy left Celtic at the end of last season and the 23-year-old has been a target of McCarthy for some time.
PA