Barcelona are reportedly worried about the high number of muscle-related injuries after Nelson Semedo was ruled out for five weeks with a calf problem.
Barcelona have endured 15 muscle-related injuries since August.
The club believes that a preseason trip to Japan could have contributed to the amount of injuries.
Ernesto Valverde said that he is making slight adjustments to their training style.
"We've not changed the way of training [this season], but we are correcting some aspects of what we do," said Valverde.