Decent write up from McNulty.
Who's next?
Carlo Ancelotti
Ancelotti was sacked by Bayern Munich in September after only one full season
The Italian insists he will be taking a sabbatical until next summer after his sacking by Bayern Munich. He usually steps into elite projects. Everton could make it worth his while financially - but would he really be interested?
Thomas Tuchel
The 44-year-old German is highly regarded and available after leaving Borussia Dortmund. He may need some persuading but is known to admire the Premier League and Everton could put together an attractive package.
Eddie Howe
Howe got Bournemouth promoted to the Premier League in 2015
Howe has built his reputation at Bournemouth and is a lifelong Everton fan. Will he feel he has taken the Cherries as far as he can? The 39-year-old has the sort of personality and background Everton chairman Bill Kenwright would like - but is it actually Kenwright's decision?
Sean Dyche
Dyche's stock is high after his work at Burnley and he may yet get the call from others. Would be intriguing to see him in charge of a bigger club with higher expectations.
Rafael Benitez
Benitez won the Champions League with Merseyside rivals Liverpool in 2005
A real wildcard this one - but a proven manager who still lives almost on the banks of the Mersey. Would the Spaniard or Everton be able to see past his Liverpool connections? And would he leave Newcastle United just when some takeover investment may be arriving?
David Unsworth
Everton's outstanding under-23 coach is highly regarded at Goodison Park and considered a future manager - but may not be ready for that big step just yet.
Sam Allardyce
A firefighter supreme who often bemoans his lack of opportunities at the top end of the Premier League. The former England boss is a real outsider but these are strange times.
David Moyes
Could former Everton manager Moyes replace Koeman?
There are reports of a possible return but the Scot has had two sackings at Manchester United and Real Sociedad and a dire relegation at Sunderland since he left Everton in 2013 after 11 years.
The 54-year-old is regarded as a figure from the club's past whose career has headed downhill since he left - and he is not a name likely to be well received by a majority of fans, who would regard any such move as devoid of ambition and imagination.
Marco Silva
The 40-year-old Portuguese is building a big reputation at Watford. He is tactically astute and a young, emerging coach - but he has only just got to Vicarage Road.
Mikel Arteta
This may seem like a long shot but the former Everton midfielder is still highly regarded at Goodison Park and is building his reputation as part of Pep Guardiola's backroom team at Manchester City. It would be a risk but one Everton may feel is worth taking.
Only 1 name stands out for me, Tuchel.