Lukaku may join Milan, after Inter almost bought Thuram which was a Milan target for fixing their Attack.
Lukaku was at Inter in Loan, and Milan is aiming to get the same deal from Chealsea.
I don't know why Inter Milan won't buy this player for the next season, Lukaku had a good performance this season. I mean he couldn't prove himself at the start of the season in Inter Milan but recently and especially in the last weeks in the Serie A and Champions League he had a good enough performance and helped his team enough. Ac Milan offered 4m for hiring this player but I think Inter Milan had to buy him because of the season he spend there.
previously Lukaku wanted to stay at Inter. I think Inter must understand that next season they still need Lukaku, especially with Edin Dzeko leaving. Inter's best option would be to buy Lukaku, who suits Inter's style of play.
but if Inter has other options up front. I think they should let Lukaku go to Milan or Arab. because previously there was news that Chelsea was negotiating with an Arab club regarding the transfer of Lukaku.