Inverness have had 15 points deducted as a result of administration, meaning they face potential relegation from League 1.
They now sit bottom, on -3 points. Regardless of what division they are in next season, they will start on -5 points.
Ferguson added: “I think the club can stay in the division if they hold onto their players. If not it’s going to be a tough ask.”
He joined Inverness last September following the sacking of Billy Dodds, with the club sitting bottom of the Championship at the time.
Caley Thistle were later relegated in a play-off against Hamilton Accies.
A former Dundee United, Rangers, Everton and Newcastle United player, Ferguson was appointed to his first full managerial role at Forest Green Rovers last year.
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