Bojan announces Milan move on birthday
Bojan, who had been on loan at AS Roma from Barcelona, said he was ready to play his part under manager Massimiliano Allegri.
"I'm already in Milan, tomorrow I will be presented footballer of AC Milan!', posted the winger, who celebrated his 22nd birthday on Tuesday.
"I'm ready for everything and can not wait to play the first game. Thank you all for the welcome and for the birthday wishes. See you tomorrow, Forza Milan."
His arrival follows on from Tuesday's signing of highly rated France Under-21 striker M'Baye Niang from Caen.
Niang's transfer was announced by the club on their website after the 17-year-old passed a medical.
Milan, who have seen supporter unrest after selling the likes of Zlatan Ibrahimovic and Thiago Silva to balance the books, lost 1-0 at home to promoted Sampdoria in their season opener last weekend and may have lost Robinho to injury for a month.