Nottingham Forest have 'shot themselves in the foot' by appointing Ange Postecoglou and will struggle to improve under ex

Nottingham Forest have been handed a stern warning following the appointment of Ange Postecoglou.

The Australian began his tenure away to Arsenal on Saturday after replacing Nuno Espirito Santo this week.

Postecoglou has signed a two-year deal at the City Ground just three months after leaving former side Tottenham .

His current club fell to a 3-0 defeat against the Gunners at the Emirates Stadium in a difficult start for their new manager.

However, Jamie O'Hara is already doubting whether the decision to bring Postecoglou in will pay off.

His arrival on Tuesday followed the departure of Nuno, who guided Forest to a seventh place finish and Europa League qualification last term.

Reacting on the GameDay Phone-In, O'Hara admitted: "If they think they're going to improve unde