Tonight's match in the Arena Nationala spells true pressure for Chelsea, after manager Jose Mourinho has said they "cannot lose".
The Blues currently sit third in the Champions League Group E table after September's 2-1 home defeat to Swiss side FC Basel, and the Portuguese manager has appeared frustrated after cutting a press conference short yesterday.
"We have to get 12 points to be out of any danger, so if we lose there we still have four matches to play and we will have to win them all," he said, speaking to Sky Sports.
"We don't want to put ourselves under so much pressure."
Arguably, Chelsea aren't the only squad feeling the heat ahead of tonight's match; Steaua lost their opening fixture 3-0 to Schalke, who currently top Group E.
Saturday's 1-1 draw at Tottenham saw Spanish striker Fernando Torres pick up a domestic ban following his send off, however he is still expected to play tonight.
The omission of players such as Juan Mata and Kevin de Bruyne has dominated the headlines over the last few weeks, and they aren't the only players to miss out on tonight's game - midfielder Eden Hazard has also been left in London due to injury.
It has been reported that Steaua manager Laurentiu Reghecampf has concerns over the fitness of midfielders Mihail Pintili and Cristian Tanase.
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