The Blues ensured they head into the second leg with an advantage after getting the better of Malmo in Thursday's clash in Sweden
Maurizio Sarri praised an improved Chelsea performance in their Europa League win at Malmo but warned them to cut out defensive mistakes.
Chelsea triumphed 2-1 at Swedbank Stadion on Thursday thanks to goals either side of half-time from Ross Barkley and Olivier Giroud, but a late Anders Christiansen strike gave Uwe Rosler's men hope ahead of next week's return leg.
Sarri's charges had lost four away games in a row in all competitions, culminating in Sunday's 6-0 hammering at Manchester City, failing to score during that run.