Barcelona coach Ernesto Valverde revealed in Friday's press conference that midfielder Arthur Melo "has been suffering physical discomfort for a while."
The manager didn't go into details of what the problem is plaguing the Brazilian, who was an unused substitute against Liverpool on Wednesday.
With Barça set to face Celta Vigo in La Liga on Saturday -- the Catalans have already won La Liga -- Valverde didn't want to reveal if Arthur would be fit to play.
"We will see on the day of the game," he said. Arthur was named in a much changed squad.
Arthur's been an ever-present this season but didn't play a single minute against Liverpool. It was the biggest surprise of the starting lineup, with Arturo Vidal picked ahead of him.