Virgil van Dijk has been back to his best this season, and he was brilliant against Luton again on Wednesday evening. The Dutch defender put in a real captain’s performance against the Hatters. He led his team to a 4-1 win from 1-0 down against the Hatters, and he was just imperious on the day. Speaking on Premier League Productions, John Hartson has been full of praise for the defender after this performance, and he says that Van Dijk may well be the best centre-back in the world once again. Virgil Van Dijk may be the best in the worldHartson spoke highly of the £75m man. “He’s been terrific …