In the end, the unexpected possibility of relegation from the lucrative Premier League might have spooked the Everton hierarchy and Allardyce, available since quitting Crystal Palace in May, fits the bill at the moment.
The Toffees hierarchy will feel they have gone for a safe pair of hands, with Allardyce having taken over both Palace and Sunderland in graver situations and led them to safety. But after a frustrating and fruitless five-week search for a replacement, the Merseyside club accepted that the former England coach was the best solution for its current troubles.
At that time, Allardyce stated that he had "no ambitions to take another job". It is a great club.
Allardyce said: "I've always thought Everton was a great club".
Watford’s Marco Silva was among the managers linked with the Everton job. Screengrab
After years of being unable to come close to matching the financial clout of the Premier League's big guns, Everton finally had significant backing thanks to new owner Farhad Moshiri.
"I'm enjoying my life more than you could believe", Allardyce told the Daily Star.
Allardyce's reign will begin on Saturday when Everton host Huddersfield Town.
Writing in his column for Paddy Power recently the soon to be Everton manager wrote about the sides troubles saying, "Everton are obviously in a bad place at the moment and, like every football club that is struggling, it's mainly down to a loss of belief".
However, Allardyce did watch his side dismantle West Ham 4-0 at Goodison Park on Wednesday night, courtesy of a Wayne Rooney hat-trick, so there is reason to be optimistic. But, after taking four points from their first two games, Everton managed the same tally from their next seven fixtures and Koeman was sacked.More news: No Christmas tree shortage in western MA