Ryan Bertrand is to miss Chelsea's Europa League quarter-final second leg with Rubin Kazan (kick-off 5pm) after missing the trip to Russia due to illness.
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.
"Not travelling is Ryan Bertrand, who is ill, and injured Gary Cahill and Oriol Romeu," read the club's official Twitter feed.
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.
The 20-year-old winger saw his opportunities limited this season at Kingsmeadow and manager Neal Ardley has allowed him to find employment elsewhere.
"Brendan has a lot of talent, but he needs to be playing and at the moment we can't offer him that opportunity," Ardley told the Dons' official website.
"So we talked about it and decided it would be best for him if he was free to join another club at the earliest opportunity.
"I want to thank him on behalf of the club and we wish him every success in his future career."
Kiernan came through the ranks at Wimbledon after leaving Crystal Palace in 2009.
The youngster made his debut as a substitute in a 3-1 defeat at Crawley in March 2011 and went on to make 18 appearances for the Dons.
