Celtic caretaker boss Neil Lennon believes Liverpool could double their money if they sold Virgil van Dijk this summer.

The interim Celtic boss famously plucked Van Dijk from relative obscurity at FC Groningen for £2.6m in the summer of 2013.

"You could double what Liverpool paid (£75m) for him," said Lennon.

"It's Liverpool's gain and there must be a lot of people out there kicking themselves about not doing it quicker - because the difference between Liverpool now and what they were defensively before him is night and day.

"He'll just keep going, I think. Who knows where his career will take him? I'm sure he'll want the Champions League and the Premier League, but there's no stopping him, really.

"He's like a Rolls-Royce. I'm surprised no one took him earlier, and none of the bigger clubs other than Southampton took him, but it was smart from them and now it's smart from Liverpool.

"He could play for Real Madrid, Barcelona, Juventus and it wouldn't be a problem. The pressures are different, but he could adapt to that no problem.

"I agree that he is the best defender in the world. He is. I don't see anyone better than him at the minute. Again, you saw his qualities during the week."