Liverpool ace Naby Keita says he found former Red Xabi Alonso his toughest opponent faced in Germany.

Keita, when with RB Leipzig, came up against former Bayern Munich midfielder Xabi regularly.

He recalled: "When I was playing Bayern, Xabi Alonso always used to make it difficult for me.

"He was so experienced. He made me suffer. The way he always changed the game meant I could never stop running.

"He was very intelligent."