Leeds have signed Scotland youth international keeper Alan Martin from Motherwell and Newcastle defender Paul Huntington for undisclosed fees.
Huntington broke into Newcastle's first team last season
Glasgow-born Martin, 18, has signed an initial two-year deal at Elland Road.
Huntington, 19, had made 11 league appearances for Newcastle, and scored in the 3-2 win at Tottenham in January.
Portuguese winger Filipe Da Costa has joined on a one-year contract from Ionokis, while Icelandic midfielder Gylfi Einarsson has left the club.
Martin told Leeds' website: "I'm top of the world to be signing for a club like Leeds, and I'm glad it's gone through."