UEFA have vowed to crack down on racism at the European Championship after acknowledging Holland's black players were abused during a training session in Krakow.

Members of Bert van Marwijk's European Championship squad were allegedly subjected to monkey chants at Wisla Krakow's Miejski Stadium on Wednesday, with captain Mark van Bommel branding the incident "a real disgrace".

Having been satisfied by the Dutch Football Association's initial assurances the abuse was not racially-motivated, UEFA announced on Friday morning they had been made aware of "isolated incidents of racist chanting".

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