Porto coach Sergio Conceicao hailed Liverpool as the best team on the planet at times this season even as he tries to plot their downfall in the Champions League.
Liverpool head to Portugal for Wednesday's second leg against Porto with a 2-0 lead from last week's first leg, and Conceicao knows he and his players have their work cut out.
"Liverpool are all about the way that I think about football," the former Portugal international said through a translator.
"I like the Liverpool dynamics, their game model. I like the way they play with the ball and without it, it's similar to how I see football.
"In my opinion, in a lot of these moments they are the best team in the world."
Liverpool dominated the first leg last week, enjoying 66 per cent possession and 15 attempts at goal.
Porto were ultimately grateful only three of those were on target and that they did not add to goals from Naby Keita and Roberto Firmino inside the opening half an hour.