Barcelona announced on Friday that midfielder Arthur Melo will miss the next three to four weeks because of a hamstring injury:
FC Barcelona[INJURY NEWS] Tests carried out have confirmed that the first team player Arthur Melo has a left hamstring injury. He is expected to be out for around 3-4 weeks. https://t.co/tYpNvlufsM
The midfielder will miss La Liga games against Athletic Bilbao, Valladolid and Sevilla and also the first leg of their UEFA Champions League last-16 tie against Lyon, per the club's official website.
Barcelona then play two games against Real Madrid, in the Copa del Rey and in La Liga, and Arthur may be forced to sit those fixtures out too.