Gary McAllister has expressed his surprise that Arsenal never made a move for Virgil van Dijk before he arrived in the Premier League, insisting that all of the big clubs had the Dutchman on their radar. Virgil van Dijk has undoubtedly been one of the greatest defenders the Premier League has seen. The 32-year-old helped elevate Liverpool into title contenders following his £75 million move from Southampton. Few could have imagined just how good van Dijk would become. Liverpool have been vindicated for breaking the world record for a fee paid for a defender. Gary McAllister expected Arsenal ma…