"Newcastle United today parted company with Sam Allardyce as its manage with immediate effect. This decision has been reached by mutual consent.
Newcastle United chairman Chris Mort said: " Mike and I would like to place on record our thanks for Sam's efforts and wish him well for the future.
"A new manager has not yet been appointed at Newcastle United. We will make a further announcement on the managerial position when appropriate."
Sam Allardyce said: " I am disappointed to be leaving Newcastle United but I wish the Club all the best for the remainder of the season and for the future."