Mauricio Pochettino will be “fuming” at the instant turnaround in Dele Alli’s fortunes under new Tottenham boss Jose Mourinho.

That is according to ex-Leeds United and Coventry City striker Noel Whelan, speaking exclusively to Football Insider about the England attacking midfielder.

Alli produced his second outstanding display in four days as Spurs came from two goals down at home to defeat Olympiakos 4-2 and seal a place in the Champions League knockout stages.

The attacking midfielder ended a run of 16 Champions League games without a goal, scoring for the first time since November 2017 against Real Madrid.

He also showed superb footwork to set up the third goal for Serge Aurier.

“You can imagine Poch is fuming,” Whelan told Football Insider. “Alli looked disinterested and average for over a year. Mourinho comes in and suddenly he looks a different player.

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“He’ll be thinking, ‘what’s going on, why didn’t he play like that for me?’

“The thing is, good players bounce back from blips. Dele Alli has had a difficult time in his career and his performances have been ropey for a long time.

“When players as good as him have a dip in form, it is noticeable. He was integral to the wins and looks hungry and confident again/

“Sometimes a change of manager actually does breathe new life into top players.”

Alli played 83 minutes of last night’s win over Olympiakos before being replaced by Tanguy Ndombele.

This was the first time a team managed by Mourinho has come from two goals down to win a Champions League game – he had lost on the previous 13 occasions.

In other Tottenham news, it can be REVEALED that Pochettino ‘blew his top’ after Levy agreed £10m Spurs ‘spy’ deal.