Bertrand sits out Moscow trip
The Blues, last season's Champions League winners, confirmed on Twitter that the 23-year-old understudy to Ashley Cole did not travel to Moscow on Wednesday.
Cahill (knee) and Cole (hamstring) were already out alongside long-term absentee Romeu (knee) and cup-tied striker Demba Ba.
Bertrand's absence means young Dutchman Nathan Ake or experienced Portuguese Paulo Ferreira could start at the Luzhniki Stadium, a venue which holds painful memories for the Blues following their penalty shootout defeat to Manchester United in the 2008 Champions League final.
Chelsea hold a 3-1 aggregate lead following their first leg win at Stamford Bridge last week, which featured two Fernando Torres goals, and are seeking to confirm their place in the semi-finals.
The Blues then play a semi-final against Manchester City at Wembley on Sunday as they continue the defence of the FA Cup trophy they have won in four of the past six seasons.
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