Both the duo defenders have signed four year deal with Sunderland hoping that they gets the chance to play for the first team as Mourinho has degraded them from Manchester.
Paddy McNair and Donald Love has been signed by Sunderland from Manchester United at a combined price of £5.5 million.
The team mates of Manchester signed a four year contract at the stadium of light to reform with their ex- United’s manager David Moyes who came to Sunderland as manager in July
"Sunderland AFC have completed the double signing of Paddy McNair and Donald Love from Manchester United for a fee of £5.5 million," the club confirmed in a statement.
"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."
Moyes told the club's website: "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."