United gunning for glory with new signing
The 20-year-old, who spent the second half of last season on loan at Motherwell, has signed a three-year contract, subject to international clearance.
The Republic of Ireland under-21 international visited Tannadice this week and was convinced to join United by manager Peter Houston.
Houston said: "I am thrilled to capture Gavin's signature.
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Hide Ad"He is exactly the type of player we try to bring to Dundee United - he is young, athletic and hungry.
"He can play either left-back or central defence and having seen his performances last season I know he can do a job in the SPL.