David Moyes has snapped up two players from his old club Manchester United, Sunderland confirmed on Thursday.
"Sunderland AFC have completed the double signing of Paddy McNair and Donald Love from Manchester United for a fee of £5.5 million," Sunderland announced on their website.
"The versatile 21-year-olds have both put pen-to-paper on four-year deals and become David Moyes’ second and third signings as Sunderland manager.
"Northern Ireland international McNair, who can operate in defence or midfield, has two seasons of Premier League experience at Old Trafford and heads to the Stadium of Light on the back of a successful UEFA Euro 2016 campaign with his country.
"Scotland under-21 international Love, who can play at full-back or in midfield, made his senior debut for Manchester United last season, playing in both the Premier League and UEFA Europa League while also enjoying a successful spell on loan at Wigan Athletic."
Sunderland boss Moyes said: “Paddy is a young, athletic player who is improving all the time. He has experience for Northern Ireland and we want to bring as many international players to the club as we can.
“Donald comes highly recommended and is another young player who I hope can develop and improve here.
“I want to add some young players to the squad as well as some senior players and both of them have got really good potential and the opportunity to improve.
"I want to bring in players who are here for the long-term as well as the short and hopefully these two are here for the long-term.”