The Everton legend will reportedly be a part of Koeman's back-room staff.
Everton coach Duncan Ferguson
Ferguson has been a first team coach at Everton for the last two years, having been promoted by former manager Roberto Martinez, but his future was unknown should Koeman take charge.
Southampton manager Ronald Koeman
The Southampton manager is currently the firm favourite to become the new manager at the club after reportedly agreeing terms this weekend.
Should he arrive at Goodison Park, he is likely to want to bring some if not all of his current coaching set up to Merseyside with him.
One man who will be coming with him is brother Erwin, although it is unknown if former Liverpool man Sammy Lee will also be a part of his setup.
Everton investor Farhad Moshiri and chairman Bill Kenwright in the stands
Any arrivals could have left Ferguson in danger of being shown the door in what is likely to be an overhaul of the non playing staff this summer.
However, the former Everton forward will be staying as part of the first team set up under Koeman according to the Liverpool Echo.
They state that he met with Blues shareholder Farhad Moshiri last week and was reassured that he remains part of the club’s plans for the future.
Everton's Duncan Ferguson acknowledges fans during the game