Manchester United great Rio Ferdinand was asked to choose between former defensive partner Nemanja Vidic and current Liverpool star Virgil van Dijk.
Ferdinand and Vidic spent nine seasons together at Old Trafford, helping United lift major honours with Sir Alex Ferguson at the helm, and are regarded by many as one of the greatest centre-back partnerships in history.
Following his record-breaking move to Liverpool, van Dijk has earned comparisons to the United duo due to his commanding performances in Jurgen Klopp's back four.
Van Dijk was crucial to Liverpool's Champions League triumph last season and looks set to add a Premier League crown to his cabinet at the end of the season.
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