Liverpool earned a 2-0 victory over Primer League rivals Manchester United on Sunday while the United winger Park Ji-sung was sidelined with knee injury.
Fernando Torres ended Liverpool's three successive defeats, scoring the opener in 65th minute with a powerful finish and David Ngog's injury time goal confirmed the victory.
Ryan Giggs, Wayne Rooney, Patrice Evra, Ji-sung Park and Darren Fletcher will all miss United's Champions League trip to CSKA Moscow.
The five players - many of them probable starters in Sir Alex Ferguson's strongest line-up - were absent from the squad flying out of Manchester on Monday afternoon.
Park Ji-sung has made another bombshell headline by announcing he would play for the national team until the Asian Cup in 2011.
``As I have reached the World Cup semifinals, I am covetous of the Asian Cup title,'' the national team skipper told reporters at the National Football Center (NFC) in Paju, Gyeonggi Province on Monday.
Park Ji-Sung admits he will be doing his utmost between now and the end of the Premier League season to convince Manchester United manager Sir Alex Ferguson that he merits a place in the team for the Champions League final against Barcelona on May 27.
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Park Ji-sung has expressed his happiness at being back in the team after starting against Birmingham.
It was the South Korean's first start since suffering a knee injury against Blackburn at the end of March last year and he was also pleased with the reaction of United's supporters.
"It is nice to be back," he told MUTV. "I played for 75 minutes, so that will give me confidence.
Ji Sung Park is confident that Man United will retain the Premiership trophy this season.
"I'm confident that we can retain the Premiership title this season.
"We've got a good squad and the manager has brought some good players into the team to improve it even further. The new signings have all impressed me in different ways.