Liverpool defender, Virgil van Dijk, has named Manchester City's Sergio Aguero as his toughest opponent.
Van Dijk has enjoyed a fine start to the season, after an excellent campaign for club and country last term.
His performances have led to him being installed as the favourite for the Ballon d'Or.
Ahead of his side's clash with Arsenal at Anfield this weekend, Van Dijk was also asked about the best players he has taken to the field alongside in his career with Groningen, Celtic, Southampton and Liverpool.
"I'm going to be a little bit biased and say one of my team-mates; I would say Roberto Firmino," he told talkSPORT.