Having begun his coaching career on the staff of Milton Keynes Dons and West Bromwich Albion, he returned to Chelsea where he served as assistant manager to Roberto Di Matteo before the latter was replaced by Rafael Benítez.
He played for Chelsea in the 1994 FA Cup Final, but his foul on Denis Irwin in the second half saw him cautioned and led to Manchester United receiving a penalty which was scored by Eric Cantona.
[3] He joined Birmingham City in July 1999 on a free transfer before spending short spells at various lower-league clubs, including Oxford United and Barnet.
On 5 March 2012 it was announced that Newton would be joining the back room staff at Chelsea, supporting Roberto Di Matteo.
He currently helps to oversee the progress of Chelsea's loan players after having been assistant first team coach under Guus Hiddink in for the second half of the previous season.
[9] On 2 August 2020, Newton was appointed by Trabzonspor on a permanent basis, after a successful period as caretaker winning the Turkish Cup.