The French firm says that it will only proceed with the deal if Italian labour unions are on board – as they are prone to regular strike action.
"The integration of Alitalia in the Air France-KLM group will reinforce its position as a European leader and also will allow Alitalia to recover its status of being a national leader," it said in a statement.
The deal would see Air France-KLM further its current standing as the largest airline on the continent but could see 1,700 job losses.
Speaking to Reuters, an official at one of Alitalia’s unions said: "It all depends on the contents of the offer.
"What we cannot accept is a take-it-or-leave-it attitude."
Figures released earlier this week show that passenger numbers for Air France-KLM rose 3.7 per cent in February.