There could be a storm brewing over Old Trafford this summer.

Apparently, Anthony Martial has lost his number nine shirt to Zlatan Ibrahimovic and it has been made clear to the United management that the Frenchman is less than happy about the situation.

Anthony Martial has started rumours among the footballing fraternity after his social media profiles had pictures of himself wearing the Manchester United No.9 shirt, days after he was forced to hand it to the Swedish striker.

Martial was switched to No.11 at Old Trafford after Ibrahimovic 'chose' the No.9 for himself following his much acclaimed transfer this summer.

But that hasn't stopped the former Monaco striker launching his new business and naming it 'AM9' ‒ which uses his initials and his squad number from last season

Martial's choice of pictures led to hundreds of fans making comments about the squad number changes, with many speculating whether he was unhappy with being ousted from the No.9 shirt in favour of Ibrahimovic and this being his way of showing his displeasure.

Ibrahimovic, who has been given an extended summer break by Jose Mourinho, posted an image of No 9 on Instagram earlier this week, writing: 'I chose the number 9.'

The Swedish striker has varied between numbers eight, nine and ten throughout his career, but with all three taken upon his arrival at Old Trafford, he was expected to have to settle for a different number.

Martial appeared to suggest he was unhappy with having to give up his number, as he changed his Facebook cover photo to a picture taken from behind him, showing 'Martial 9' emblazoned on the back of his shirt.

The youngster was bought from Monaco as a striker last summer, but played the majority of his matches on the left-wing, and his new number appears to suggest that is where he will continue to play for the Old Trafford club.

The Frenchman admitted in March that while he still sees himself as a striker, he enjoys playing on the flank.

According to the Mirror, Martial said: "I am a striker, but I love playing wide.

"The main thing is wherever I play I enjoy it and help the team. I must continue to work hard in training. I need to think more like a goalscorer, sometimes I get so immersed in the game because I love general play so much.

"Someone like Cristiano Ronaldo focuses on scoring to progress, so perhaps I need to think more about scoring."

Even though he is clearly unhappy at having to give up his number nine shirt, the Frenchman is very unlikely to exit Manchester United and will play a very important role in Mourinho's new look United side.

This story will drift away with time and it will all be forgotten, especially if the team are successful and Mourinho can harness the talents of the 20-year-old, after a decent Euro Championships this summer.

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