Barcelona captain Leo Messi is out of action less than two weeks ahead of the opening of La Liga season after injuring his right calf in training on Monday.
The Argentina star has already been ruled out of the team's trip to Florida for a one-off friendly against Napoli in Miami on Wednesday.
"Tests carried out have diagnosed a grade 1 calf strain," the Spanish champions said in a statement, an injury that can require around two weeks of recuperation.
"Messi will remain in Barcelona and will now not travel to the USA for the club's tour. His availability to come back to action will be dictated by his recovery from the injury."
The club open the new La Liga campaign at Athletic Bilbao on August 16.
(For more sports news and updates, follow Ahram Online Sports on Twitter at @AO_Sports and on Facebook at AhramOnlineSports.)