Forward Ademola Lookman said on Sunday he had put in a formal transfer request at Atalanta after facing poor treatment at the Italian club.
England-born Nigeria international Lookman was Atalanta's second-highest scorer in Serie A last season, netting 15 goals. Italian media reports have linked the former Everton, Fulham and Leicester City player with a move to Inter Milan.
Atalanta did not immediately respond to an email requesting comment.
Lookman, who joined Atalanta in 2022 on a four-year contract, wrote in a letter shared on social media that he had agreed with the club ownership that he would be allowed to move if there was a fair offer.
"Despite now receiving an offer in alignment to what I believe had been discussed sadly the club are blocking the opportunity for reasons I do not understand," he wrote.
"After many months of broken promises and what I feel has been poor treatment towards me as both a human being and as a professional footballer, sadly I feel I have no choice but to speak out... I can confirm I have now handed in a formal transfer request."
The 27-year-old said in February that he had "dealt with many difficult moments" at Atalanta after former coach Gian Piero Gasperini called him "one of the worst penalty takers" he had ever seen over a missed spot-kick during a loss that eliminated them from the Champions League.
Lookman said Gasperini's comments were "deeply disrespectful" and hurtful. Gasperini later said he had not meant any offence to Lookman.
Atalanta, who finished third last season, begin their Serie A campaign at home against Pisa on August 24.
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