Porto boss Sergio Conceicao has declared Champions League quarter-final opponents Liverpool the "best team in the world".

The Reds go into Wednesday night's second leg against the Portuguese side 2-0 up from the Anfield first leg.

"There is no greater motivation than to be competing in a quarter-final and to make a historical turnaround," he told his press conference on Tuesday.

"I like the way Liverpool play. Sometimes, they are the best team in the world.

"We have a two-goal deficit to make up against a very strong team who are quick on the break. Getting the attacking balance right is fundamental.

"The technical team will establish the game plan, then it's up to the players to put it into action. They are responsible for everything good that has happened so far.

"We have to work for defensive organisation and we are 100 per cent focused and aware of what our opponents are doing. It is not difficult to analyse Liverpool, but it is difficult to counteract because they have so much individual and collective quality.

"They're great!"