McDermott follows Keegan through the exit door
Newcastle assistant boss Terry McDermott and reserve team coach Adam Sadler have left the club.
Their departures follow that of manager Kevin Keegan last Thursday.
McDermott had been taking first-team coaching since early last week when the differences between Keegan and the board that led to his resignation became apparent.
McDermott, a former Magpies player, had a long coaching association with the club dating back to Keegan's first stint in charge in 1992.
He also worked under Kenny Dalglish, Graeme Souness, Glenn Roeder and Sam Allardyce at St James' Park.
Former youth team goalkeeper Sadler worked at the club's academy until being promoted by Roeder in 2006.