Liverpool star Virgil van Dijk has named a former Arsenal player as one of his toughest opponents ever. The Dutchman is up there with the best defenders in world football. He has been incredible ever since he joined Liverpool in 2018, and he has faced some elite forwards over the years. From Lionel Messi and Cristiano Ronaldo to Erling Haaland now, Van Dijk has played against some of the very best, and he rates them all highly. However, there is also a surprise name on the defender’s list of the toughest players he has faced in his career. He used to play for Arsenal. Virgil van Dijk says form…