The 24-year-old won the Scudetto with the Rossoneri last season will embark on his second season with the club.
Speaking of his targets for the new season, which sees Milan kick off against Lazio on Friday, Boateng insists he wants to win every competition.
"I want to win everything and we will be focussed on all competitions," Boateng told Sky Sport Italia.
"I cannot wait to start playing again after a long pre-season.
"We are all eager to start playing, but there are many teams who are interesting this year like Napoli, Lazio and Juventus.
"They have all strengthened and I cannot wait to play against them."