Lionel Messi and Cristiano Ronaldo are struggling to sell tickets for Argentina's friendly against Portugal at Old Trafford on Tuesday. Argentina's Messi and Portugal's former Manchester United forward Ronaldo are due to go head-to-head but just 15,000 tickets have been sold.
Tickets for the match cost £40.
"I don't know why we haven't had more sales," match organiser Leo Morales said.
United's stadium's capacity is 75,731.
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