Celtic: Club could face choice of Martin O’Neill or Robbie Keane

However, while Ferencvaros failed to punch their weight domestically, they overperformed in the Europa League after falling to Qarabag in the Champions League play-off round.

Keane guided his side to 12th place in the league phase, four points and nine places above Celtic despite having one of the smallest budgets. Their only defeat was against eventual semi-finalists Nottingham Forest.

On their way to the last 16, they defeated Rangers, Genk, RB Salzburg, and Ludogorets, while drawing away at Fenerbahce too.

They conquered Ludogorets again over two legs in the play-off round, before falling to Braga of Portugal 4-2 on aggregate despite a 2-0 win at home.

Ferencvaros often played 3-5-2, and Keane has often described his football as attacking and once said he threatened to drop his centre-backs if they passed to each other too often rather than opting to play the ball forward.

“I don’t like my centre-backs keeping the ball for the sake of keeping the ball,” the former Tottenham, Liverpool, and Leeds striker said.

Former Celtic captain Scott Brown and youth coach Jonny Hayes are mooted as potential assistants to Keane, as well as former Aberdeen manager Stephen Glass, who has been with him in Hungary.

Could he be the man to replace O’Neill? Or could he even work with his former international manager at Celtic?