Barcelona coach Josep Guardiola is facing a mounting injury crisis in defence ahead of Wednesday's Champions League semi-final first-leg encounter against Real Madrid in the Santiago Bernabeu.
Brazilian full-back Maxwell and Argentine centre-half Gabriel Milito have become the latest players to pick up problems.
Milito was forced off after 65 minutes in the 2-0 win against Osasuna with muscular problems in his right leg, while Maxwell picked up a groin strain.
A report on Barcelona's official website states that both players will undergo tests on Sunday and only then will Guardiola be able to take a decision on their availability for their trip to Madrid.
First-choice left-back Eric Abidal is currently recovering from a surgery to remove a tumour and his deputy Adriano picked up an injury in the league game last week, leaving the Spanish champions without any recognised cover at left-back.
One possible option would be to utilise the versatile Malian midfielder Seydou Keita on the left-hand side of defence. Striker Bojan will also sit out the third of a series of four Clasico fixtures in this month.