Greece international Sotirios Kyrgiakos has completed his transfer to Liverpool and signed a two-year contract.

The 30-year-old passed a medical to finalise his switch from AEK Athens, and will go straight into the squad for Monday's Barclays Premier League home match against Aston Villa at Anfield. Liverpool manager Rafael Benitez is without two key defenders through injury.

Reds boss Rafa Benitez said: "He has had experience in Scotland with Rangers, and in Germany with Eintracht Frankfurt as well as with the Greek national side.

"He is strong and good in the air, and we were looking for experience and he is the perfect answer."

Danish centre-back Daniel Agger will have an operation on his back in Germany on Tuesday, and will be out for six weeks.

Martin Skrtel is still struggling with a damaged jaw, sustained at Tottenham last weekend, and is not expected to be fit to face Villa.