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.
"I wanted to get started and unfortunately I had a mishap during the first training session which will keep me out of action for a while," the five-time Ballon d'Or winner posted on Instagram.
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.