In late October 2009, after impressing in the U-20 World Cup, Adiyiah was reported to be close to joining Serie A club Milan. Speculation increased as Fredrikstad announced they had received a bid €500k for the young striker from a big European club. The rumour was eventually confirmed by Milan CEO Adriano Galliani on 1 November, and six days later the Ghanaian signed his new contract, as he had passed routine medical examinations.