Lionel Messi has revealed that the timing of his current injury was "really bad," keeping him out longer than initially expected from the minor diagnosis.
Messi has missed the early weeks of the new season because of a calf injury suffered before Barcelona's pre-season tour to the United States.
The 32-year-old ruled himself out of Saturday's clash with Valencia and remains unsure whether he will be available for next week's Champions League date with Borussia Dortmund.
"I feel better," he said in an interview with SPORT. "It [the injury] was really bad because it happened on my first day back [after the Copa America] and it originally looked to be something minor but, in reality, I have been out of action for the past 15 days.
"Now I know what it is and I feel more at ease. I will return when I feel I have fully recovered.
"I've spent a long time on the sidelines. As soon as I started this happened to me and I can’t wait to return."
Barca have struggled in their skipper's absence, winning one of their opening three LaLiga games.