Liverpool defender Sotirios Kyrgiakos has joined Bundesliga side Wolfsburg on a two-year contract.
In June Kyrgiakos looked to have after making the required number of appearances to trigger the extension.
But on Monday the Reds said the 32-year-old Greek defender had left the club for the German side.
Liverpool have not revealed whether they have received a fee for Kyrgiakos.
Kyrgiakos made 49 appearances for the Reds, scoring three goals, after signing from AEK Athens in August 2009.
Wolfsburg coach Felix Magath was keen to bolster his defence following his team's 4-1 loss at Borussia Moenchengladbach on Friday in the Bundesliga.
Kyrgiakos said he was looking forward to returning to Germany after spending two seasons at Eintracht Frankfurt from 2006 to 2008.
"Wolfsburg are a good club. They won the championship in 2009," he told the club's official website.
"I'm here to play and I would like to play every game."