“It was going to take lots for me to depart Newcastle to be sincere and I wasn’t simply going to depart to go anyplace so it needed to be the best place for me and my household and I believe this can be a good place.
“Each time I got here to play at Leeds the environment was wonderful, it was at all times bouncing and a extremely powerful place to play, and [I’m] simply trying ahead to having that on my aspect quite than having to play in opposition to.”
He made 214 senior appearances for the Magpies, however performed solely 787 minutes for Eddie Howe’s aspect within the Premier League final season – principally in its place.
Longstaff additionally made 5 appearances within the Carabao Cup final season, however was an unused substitute as Newcastle defeated Liverpool 2-1 within the last to win their home trophy in 70 years.
Leeds had already agreed private phrases with the English midfielder however had a proposal of £10m rejected by Newcastle earlier this week.
Longstaff is Leeds’ fifth signing this summer time following the arrivals of defenders Sebastiaan Bornauw, Jaka Bijol and Gabriel Gudmundsson in addition to German ahead Lukas Nmecha.
Daniel Farke’s aspect will start their Premier League marketing campaign at dwelling to Everton on 18 August.
They play Manchester United in a pre-season pleasant in Stockholm on Saturday, earlier than additional friendlies in opposition to Villarreal and AC Milan in August.

