Jose Mourinho is reportedly lined up to replace the Dutchman.
Manchester United boss Louis van Gaal's future apparently does not depend on success in the FA Cup, with the Daily Mirror reporting that he will be sacked regardless of any silverware that could head the club's way.
Jose Mourinho has been strongly linked with the manager's job at Old Trafford for the start of next season, and the Mirror reports that boardroom opposition - notably from managerial great Sir Alex Ferguson, and from Sir Bobby Charlton - has eased and there has been an acknowledgement of a need for change in the dugout from the summer.
Van Gaal has been under a lot of pressure for much of the season after the side slumped from at one time being top of the Premier League table to being four points outside of the Champions League places now, making qualification for next season's competition unlikely.
United were also eliminated from the Champions League at the group stages, and then knocked out of the Europa League in the last-16 by fierce rivals Liverpool.
Van Gaal's men meet Everton in the FA Cup semi-final at Wembley a week on Saturday and are favourites to go on and lift the trophy after they were 2-1 winners at West Ham United on Wednesday night.
It shows Manchester United's determination to restore their reputation at the top of English football and in Europe by appointing a three-time Premier League winner, and two-time European Champion. No-one can doubt that he is a proven winner.
But there have been times this season when van Gaal's style of player has been under the spotlight not just his managerial ability, and Mourinho isn't exactly the type of manager that goes for all-out swashbuckling attacking football, so it will be interesting to see just how things fit should the appointment eventually be made.