The 21-year-olds have both put pen to paper on four-year deals and take Sunderland's number of summer signings to three.
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."
Source : PA
Source: PA