Chelsea manager Roberto Di Matteo has revealed Ashley Cole will miss Wednesday's UEFA Champions League game with Shakhtar Donetsk due to a hamstring injury.
Ryan Bertrand is likely to replace him at left-back but Di Matteo was keen to stress Cole is not expected to be out long-term.
"Ashley Cole won't be available tomorrow, he has a problem with his hamstring, shouldn't be out for long," said the Italian.
"Ryan Bertrand has always performed well for us when he's played and I have full confidence he will play a great game."
Chelsea lie second in the Group E table, three points behind their Ukrainian opponents, and De Matteo was in confident mood ahead of the game at Stamford Bridge.
"We had must-win games last season and tomorrow is the same, we need to play a perfect game but we are strong at home," he added.
"The team has a winning mentality and experience of performing in big games like this, which helps. We have very good players.
"We need to be at our best, every player has to perform to the best of their ability. The early goal in Donetsk helped them.
"The way they played in Turin (against Juventus) showed their confidence, we need to put them under pressure and score the goals we need to win."
Cole's injury could also rule him out of England's friendly against Sweden next week, in which he had hoped to win his 100th international cap.