The former Ajax man says Brendan Rodgers' approach came too late as he has already decided to move to La Liga and sign a four-year deal with Atleti.
The 24-year-old had been linked with a number of sides during the close-season but opted to swap the Eredivisie for La Liga at the last minute and signed a four-year deal with Atletico.
Liverpool, though, secured defensive additions in the shape of Tiago Ilori and Mamadou Sakho, leaving the Belgian content with his decision.
"The club have been following me now for two or three weeks, and you could see they really wanted me," he told reporters. "That is why I turned down approaches from other teams. Liverpool, for example, appeared in the last few days, but I had already made my decision.
"The truth is that Atletico made a huge effort to convince me."