The striker has bagged 14 goals this season to go with the 20 he bagged during the previous campaign.
The Colombian was a target for West Ham last summer but talks broke down as the transfer window slammed shut.
However, according to reports in Italy, Bacca's move to the Hammers could be back on as he has asked to leave.
The 30-year-old's agent was reportedly at Milan's headquarters on Monday to speak with the club's owners about moving on.
Bacca may well get his wish too with Milan not against letting him go if they can bank around £25million.