The 23-year-old has scored nine times in the Premier League this season but is not due back until after the international break in late March, with an earliest return perhaps the London derby against Tottenham on 2 April.
Chelsea’s league form has stuttered of late but they still sit fourth in the league table, with the chance to close within a point of Nottingham Forest.
The Senegal striker has been Enzo Maresca’s forward of choice across the campaign but faces a spell on the sidelines after sustaining a muscular problem.
“Nico will be out until the international break, probably available after the international break,” the Chelsea manager confirmed.
Jackson suffered the injury against West Ham earlier this month with neither the player nor his club initially believing it to be serious.
