Chelsea suffered a 1-0 defeat to Borussia Dortmund and must now beat the German side at Stamford Bridge to progress to the quarter-finals of the Champions League.
Chelsea boss Graham Potter believes the Blues played well against Borussia Dortmund but were unlucky to lose to the German side.
Potter believes Chelsea need a bit of luck to beat the Germans at Stamford Bridge and insists Chelsea will continue working on improving.
Potter told BT Sport: “You always need a bit of luck but you can’t wait around for luck, you have to keep working.
“The boys have been fantastic with their work but we are still suffering at the moment. But we will keep on working.”