Maresca said last week that Marc Guiu was also expected to be out for a while after limping off during Chelsea’s win over West Ham this month.
Chelsea, who are in fourth place, visit Brighton again in the league on Friday and questions will be asked about why they did not reinforce their attack last month.
However the former Villarreal player missed last weekend’s FA Cup defeat by Brighton and tests have indicated that he will not be back until the game against Tottenham on 2 April.
Chelsea had hoped Jackson would make a swift return after he pulled up during the first half against West Ham.
Chelsea are facing a crisis in attack after discovering that Nicolas Jackson will be out until April with a hamstring injury.
