Denis Suarez is a doubt for Barcelona's La Liga opener with a hamstring problem, while Andre Gomes' expected move away from the club has been thrown into doubt by a similar injury.
The club confirmed Spain international Suarez will miss around three weeks after damaging exactly the same muscle as team-mate Gomes.
The Portugal midfielder has been linked with Premier League sides Arsenal and West Ham, having struggled to settle at Camp Nou since joining from Valencia in 2016.
Reports suggest he could be sidelined for approximately two months, although the club did not provide a timeline for the 25-year-old's recovery.