Argentine striker Jonathan Calleri says he has signed a contract with West Ham, believed to be a season-long loan deal.
The 22-year-old, who played at Sao Paulo last season on loan from Boca Juniors, was also linked with Chelsea and Tottenham, but has claimed to have signed for Slaven Bilic's team.
Calleri is set to represent Argentina at the Olympic Games in Brazil this month and he informed ESPN of his move to England, which is dependent still on a work visa.
"The deal is done. It is sure that I am going to play at West Ham," he said. "All that is left to finish is the work visa and if there are no other problems, if all goes well, I will be playing there.
"Playing in Europe has always been my dream. It is a league that has everything, great players, great managers. I would like to be able to perform at that level and that is why I want to go there."
Calleri says he could still see himself returning to play for Boca at some stage, adding: "I would love to go back to Boca Juniors and have the fans welcome me."