Roberto de Zerbi fears Pervis Estupinan will be out for about a month after suffering an injury in Brighton's six-goal thrashing at Aston Villa.
'He's injured and can't play for a long time,' said De Zerbi ahead of Thursday's Europa League tie in Marseille. 'One month, more or less. I don't know the right time but it's a muscular injury and it is not for a game or two.
'Unfortunately, it is an important player we are losing but we can play in that position with Tariq Lamptey, Igor Julio or others.