West Ham and AC Milan have agreed a €30m (£25.3m) transfer fee and his agent met with Irons chiefs in London earlier this week to Hammer out a deal.
Italian reports suggest he rejected the Hammers first offer, but was more convinced by an improved second proposal said to be worth €4.5m per season (£73,000
Calciomercato.it claim Bacca has asked for West Ham to wait until Monday before giving a definitive response. This is because the Colombia international is still hoping that Atletico Madrid will improve their offer.