The Saints boss is said to be Goodison bound
A multiple league and double European Cup winner as a player, success has followed the Dutchman into management, where he's won three league titles and one domestic cup - as well as leading the Saints to successive record finishes in the Premier League.
Few Evertonians can grumble at their side's ambition, not least with owner Farhad Moshiri set to provide Koeman significant funds with which to bring Champions League football to Goodison Park.
Moshiri (L) is tipped to back the new man with significant funds
There is, however, one aspect of the prospective appointment that would not sit at all well with the Blue half of Liverpool.
Sammy Lee, a former player and coach at Everton's city rivals, happens to be one of Koeman's key staff members at St. Mary's and some fans on Twitter fear that the Liverpudlian could return to his hometown alongside the Saints boss.
Lee (centre) celebrates against his former side
Three league titles and two European Cups at Anfield: He couldn't, could he?
Don't know why but I have a bad feeling about Koeman.— Trish1878 (@Azzurri1878) 2 June 2016
I'm lying. I do know why.
Hope he doesn't bring that fat blurt Sammy lee with him— Paul Johnson (@pjohnson1878) 2 June 2016
If Koeman comes in then his little Goblin cannot enter. David Unsworth to take first team coaching in preference. pic.twitter.com/DHPMz9vTu0— John Merro (@johnmerro1) 2 June 2016
He's fat, he's round, don't want him at our ground, Sammy Lee, Sammy Lee— Joe Bach (@Joebach1878) 2 June 2016
All will be ruined when Sammy Lee's announced as assistant the horrible little goblin— Joe (@joewhitehead__) 2 June 2016
Be arsed with Sammy Lee!— #NSNO (@AllezAllezEFC) 2 June 2016
Hoping to God Koeman doesn't bring Sammy Lee with him— Ged Robinson (@Ged_Robinson) 2 June 2016
Bring Mane Koeman but leave Sammy Lee— Mark Ellis (@Markthablue) 2 June 2016
I'd be happy with koeman but he's not bringing Sammy Lee with him the kopite midget— Ian (@Ian_efc1878) 2 June 2016
Sammy Lee stinks of piss.— Han's Tours (@Hanstours) 2 June 2016