Eddie Howe has left his role as Newcastle manager following discussions with the club hierarchy.
This follows a summer in which the Magpies have lost key players.
Sandro Tonali and Anthony Gordon have left for Tottenham Hotspur and Barcelona respectively.
And there is uncertainty over their captain Bruno Guimaraes, who is being heavily linked with Arsenal.
According to Sky Sports, those sales have played a factor in Howe’s decision, amid concerns about what the squad will look like at the start of the new campaign.
Newcastle have already signed 20-year-old winger Bazoumana Toure from Hoffenheim for £42m, 18-year-old midfielder Sean Steur from Ajax for £23m and 20-year-old goalkeeper Ewen Jaouen from Reims for £18.5m.
However, they have missed out on Switzerland international Johan Manzambi, who decided to move to Aston Villa.
Newcastle have already started the process to find Howe’s successor with a number of names on the list of sporting director Ross Wilson and CEO David Hopkinson.