Netherlands international Van Dijk was instrumental in the Reds' Champions League winning campaign.
Speaking ahead of Wednesday's final in Istanbul, Pedro said he saw similarities between his opponent and Ramos.
"They are very good central defenders, probably at this time at the top," he said.
"Sergio Ramos is very good. I know him very well: great defender, great with the ball.
"Van Dijk is also the same: so strong, very good in the air, scores goals. Two big players.
"He's in a good moment. Last season with Liverpool, he had a great season winning the Champions League and the best player in the premier league. He's in a good moment and he's a good defender."