The Norweigan star dropped out of the team to face Luton Town today through injury.

Pep Guardiola does not know how long Erling Haaland will be injured forCredit: Getty

Haaland, 23, had been ever-present in the Manchester City side in the Premier League this season.

The prolific forward has started every league game this campaign, scoring 14 goals in 15 matches.

However, Guardiola has now revealed that Haaland has a foot injury.

The big concern for the manager is that he does not know when Haaland will be back.

The Citizens will be monitoring the striker’s recovery “day by day”.

Guardiola said: “He has a bone stress reaction in his foot and after the last game he felt it.

“He can’t play.

“I don’t know how long he’s out.

“Week by week, day by day, we will see what happens.”

And fans have reacted negatively to the news on social media.

One fan fumed: “There goes our treble hopes.”

A second wrote: “The fact Pep can’t confirm when he is going to be back is a serious cause for concern. Let’s hope Alvarez turns into prime Aguero.”

A third commented: “Bro is enjoying Christmas in Norway.”

Manchester City were winless in their last four games in the league.

This run of form has seen them drop down to fourth in the Premier League table, seven points behind Liverpool.