Liverpool star Virgil van Dijk labelled Barcelona great Lionel Messi his toughest opponent.
Van Dijk and Messi went head-to-head last season, when Liverpool produced an incredible second-leg comeback to beat Barcelona in the Champions League semifinals.
The Netherlands international paid tribute to Messi, a record six-time Ballon d'Or winner who is regarded as one of the greatest players of all-time.
"There are some difficult strikers out there, but probably Leo Messi," Van Dijk wrote on Twitter when asked who his toughest opponent was.
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However, Van Dijk also credited Sergio Aguero, having faced the Manchester City forward regularly in recent seasons.
Asked who the hardest player to mark was, the defender replied: "Aguero."
Van Dijk said he was "feeling fine" and would be ready to go when the Premier League season, which is suspended due to the coronavirus pandemic, resumes.
Liverpool held a 25-point lead atop the table when the season was stopped.