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A mum fears her baby may be left brain damaged after being hit in the head by a football from a kickabout involving Chelsea’s Cesc Fabregas .

Victoria Diethardt, 29, says she was in a private park in London - where ball games are banned - when her son Mark was hit hard on the side of the head.

The worried mum took the six-month-old tot to A&E following the incident on Sunday, the Sun reported.

She returned to her GP the following day when she says her baby was "a different boy" after sleeping all day and staring blankly when he woke.

The infant is now reportedly awaiting a scan after a specialist told Victoria and her husband there was a possibility of brain damage.

(Image: Chelsea FC via Getty Images)

Victoria says she was lying on the lawn in residents-only Belgrave Square Gardens near to the Spanish midfielder, his partner Daniella Semaan and their children when a stray ball hit Mark "very hard".

She told the Sun that Fabregas "shrugged an apology" before retrieving the ball and packing up to leave with his family.

Victoria said she asked Fabregas for his name and number but Daniella stepped in to offer hers.

The mother told the Sun: "She looked at my son and said ‘I’m sure he’ll be all right’ — but I wonder how she’d have felt if it was her baby?

"She insisted one of her daughters had kicked the ball – not her partner."

A spokesman for Fabregas confirmed the incident had taken place and told the Sun: "Daniella’s daughter kicked the ball — not hard — and it hit the baby.

"Both Daniella and her daughter apologised profusely and Daniella has called and texted since to see if the baby was OK.

"When they got no response they presumed there was no cause for concern."

A hospital report sent to the family's GP said Mark had suffered a "minor head injury" and "concussion".

He remains under observation at home and is due to be seen again by a private paediatrician tomorrow.

Austrian-born Victoria is reportedly considering legal action against the footballer to cover the cost of her son's medical bills.