Aberdeen and manager Derek McInnes have parted ways by “mutual consent”.
McInnes’ eight-year stay at Pittodrie was brought to an end on Monday following a recent dip in form in the Scottish Premiership.
The club have also parted ways with his number two, Tony Docherty.
Commenting on the announcement, McInnes said: “This season has been unprecedented due to a number of factors and I am as frustrated as anyone that results haven’t been of the high standard which we set.
“My motivation to deliver success has never wavered and during my eight-year tenure my staff and I have worked hard to elevate expectations and set a minimum standard which should be demanded at a club like Aberdeen FC.
“I would like to thank all the players who have featured in my teams over the years, my current staff and players for their efforts and all the staff behind the scenes for their hard work and endeavour.
“To the supporters for their continuous backing and, of course, the board for their support during my time at the club.”
McInnes, 49, first became Aberdeen boss in March 2013.
He guided the Dons to a League Cup victory in 2014 and delivered second-place Scottish Premiership finishes in 2015, 2016, 2017 and 2018.
Aberdeen have also made Europe in every full season under McInnes.
The ex-Rangers and Dundee United midfielder turned down the chance to join the Light Blues in 2017, opting instead to stay at Pittodrie.
Aberdeen have won just twice in their last ten games and have slipped to fourth in the Scottish Premiership. Hibs are three points in front with a game in hand.
McInnes’ last match in charge of the club was another frustrating goalless draw at home to Hamilton on Saturday.
AFC chairman Dave Cormack said: “During his time in charge Derek raised the bar and delivered a level of consistency not seen at the club for many years, qualifying for Europe each season, and delivering a memorable Scottish League Cup win at Celtic Park in season 2013/14 with 43,000 Dons fans in attendance.
“Clearly, results since the turn of the year have been disappointing and frustrating for everyone. Derek and I reviewed where we were and agreed that this was the right time for him to step down.
“The club now has the opportunity to appoint a new manager ahead of the new season where, with a number of players out of contract, we have work to do to build a competitive squad.
“Derek and Tony leave with our thanks and gratitude for what they have achieved during their tenure. We wish them well for the future.”
The remaining six league games will be led by Paul Sheerin with support from Barry Robson and Neil Simpson.
Cormack added: “The board will start the search for the new management team immediately and has a clear timetable in place.
“In the meantime, we believe we have a robust interim solution for the rest of the season and the Scottish Cup which is still all to play for.”