Simon Grayson has been relieved of his duties as Leeds United manager.
The manager had been coming under increasing pressure following their poor display in the league, culminating in an embarrassing 4-1 defeat to Birmingham City.
Chief Executive Shaun Harvey said: “We have 18 games to go this season and are still within touching distance of the Play-Offs, but felt with the transfer window now closed we needed to make the change at this time in the belief that a new managerial team will be able to get more out of the existing squad of players and make the difference."
In a statement the club went on to say: "Simon and his staff have given the club over three good years service and we would like to place on record our thanks and wish them all the best for the future."
Youth team manager Neil Redfearn has taken temporary charge of the first team until a new manager is found.
Speculation as to who will be the new manager is rife, with Neil Warnock and former player Gordon Strachan being suggested as potential appointments.