Liverpool hero John Arne Riise admits Andrew Robertson's emergence this season has surprised him.

Former Hull City defender Robertson has nailed down Riise's old left-back spot during his debut season at Anfield.

“To be honest, I didn't see it coming," Riise told the Liverpool Echo.

“I didn't understand why Liverpool bought him in the beginning. People were talking about getting a big name player at left-back.

“He only played a few games early on in the season with Alberto Moreno the preferred left-back at that time. When Moreno got injured, that gave Robertson his chance and he did extremely well.

“I have been really impressed by him. He's aggressive, he's offensive, he's quick and he never stops running. Hopefully now he starts getting more assists and a goal or two. That's what is maybe missing from his game so far."