Republic of Ireland and Newcastle winger Alan O'Brien has agreed personal terms for a move to Hibernian. He will join the Scottish club on July 1st, after his United contract expires.
The two clubs have yet to agree a compensation fee for the 22-year-old player.
O'Brien made nine first-team appearances in six seasons on Tyneside and also spent a month on loan at Carlisle.
The Dubliner made his international debut against Holland in August 2006 and has won a total of five caps.
Hibernian manager John Collins said: "We are delighted to have signed Alan on a three-year contract at Hibernian.
"He is a young player who has had the best possible grounding at Newcastle United and while his first-team experience has so far been limited, his quality is without question, and that I think is underlined by his appearances for the Republic of Ireland.
"A few other clubs were naturally drawn to him as his current contract at Newcastle was coming to an end, but Alan has chosen Hibernian to progress his career knowing that this club continues to provide the best possible platform for a young player to learn and enjoy the game.
"Alan is a wide player and very, very quick. He knows already the way we like to play the game and we expect that he will see a great deal of the ball. He is an exciting young player and one that I am sure our supporters will appreciate."
O'Brien will join his new team-mates in time to travel to Austria on Sunday for their week-long pre season training camp.
He will be reunited with former Newcastle coach Tommy Craig, who is assistant manager at Easter Road.
O'Brien said : "Any player who has worked under Tommy will tell you that their football education has benefited greatly from his influence and guidance. He is an excellent coach and I'm certainly looking forward to working with him again, but there is also the opportunity to work with John Collins.
"As a player John has pretty much seen and done it all, and as a manager he has already made a great impact at Hibernian.
"Everybody in the game is I think aware of what has been happening at Hibernian over the last few years, the quality of young player coming through the ranks into first-team football is exceptional.
"I have enjoyed my time at Newcastle United immensely but I believe that with Hibernian I can progress both at club and international level."