Former Manchester United manager Louis van Gaal was full of praise for the club and his players after leaving the club.
The Dutchman led the Red Devils to FA Cup glory after Saturday's 2-1 win against Crystal Palace at Wembley.
According to reports in England, he will be replaced by Portugal's Jose Mourinho.
"It has been an honour to manage such a magnificent club as Manchester United FC, and in doing so, I have fulfilled a long-held ambition," van Gaal wrote on the club's official website.
"I am immensely proud to have helped United win the FA Cup for the 12th time in the club's history. I have been privileged during my management career to have won 20 trophies but winning the FA Cup, which is steeped in so much history, will always be one of the most special achievements of my career.
"I am very disappointed to be unable to complete our intended three-year plan. I believe that the foundations are firmly in place to enable the club to move forward and achieve even greater success.
"I hope that winning the FA Cup will give the club a platform to build upon next season to restore the success that this passionate set of fans desire.
"I thank my players and wish them well for next season.
"It has been a pleasure to work with them and it has been particularly rewarding to see so many young players take their chance to break into the first team and excel. I look forward to watching the continued development of these young players next season.
"Thank you to the owners and board of Manchester United for giving me the opportunity to manage this great club."