And now believes he is worth as much as £60million.
“I said to Stoke at the time we should have bought him for £8m – it was cheap,” he told the Scotsman.
“Liverpool could afford to throw that at him though, and if it hadn’t worked it wouldn’t have been a gamble for them.
“What’s that £8m worth now? Put a five in front of it at least – it’s probably £60m, £70m, for a left-back.
Andy Robertson has been excellent for Liverpool (Image: EPA)
“Fair play to him. And the biggest thing for him now will be if they can win that league – they’re in a great position.”
In November, Klopp claimed Robertson had only reached 75 per cent of his potential.
“I don’t compare seasons, to be honest, but I’ve known Robbo now for one-and-a-half years and I feel that he’s at 75 per cent – maybe less – of what he can do,” he told Liverpoolfc.com.
“There’s a lot of potential still. But it’s all good.
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Andy Robertson joined Liverpool for just £8m (Image: EPA)
“He improved a lot but there is still a lot to come, he is still a young fella. There’s enough time for that.
“In specific games he is outstanding; sometimes he is not as much involved as we want him to be.
“The full-backs in whatever system we play have an unbelievably important role, not only in defending but especially in attacking.
“It’s normal that he expects more from himself and I expect more because it’s obvious there is still a lot to come.”