New appointments often lead to the gutting of backroom teams, but despite bringing three of his most trusted associates with him, Koeman opted to keep Big Dunc around.
And the popular Scot is set to spent the coming campaign alongside Koeman, his brother Erwin, fitness coach Jan Kluitenberg and goalkeeper coach Patrick Lodewijks in the Goodison Park dugout.
The Koeman brothers
"I am very pleased that Duncan Ferguson is the last member in our technical staff,” the 53-year-old told the Liverpool Echo on Thursday.
"That is good because I like to have somebody in the club who really is an Evertonian man with a big history in the club.
"He knows the club and I think that's a very important reason to have him in."
Few men alive know Everton quite lack Duncan Ferguson does, having scored 61 goals in 245 appearances spanning 12 years - though interrupted for two.
Ferguson acknowledges the Everton fans during his testimonial
Following his retirement from football in 2006, Ferguson spent five years in Spain but returned to Goodison Park at the start of the decade to begin work in the Toffees' academy.
Then, in 2014, the 44-year-old found himself promoted to the first team coaching staff by Koeman's predecessor Roberto Martinez and has remained there ever since.
Following the Spaniard's sacking in May, Ferguson was briefly mentioned as a possible successor, until the new boss arrived in June.