Telstegen announced through social media that he would follow the doctor's advice to undergo lumbar surgery and his recovery time is expected to be 3 months.
According to reporter Javi Miguel, if this is the case, Barcelona will not be able to enable the "long-term injury clause" and use 80% of his salary to register other players.
The long-term injury clause is a special regulation in the La Liga that allows clubs to temporarily introduce or register alternative players in the event of long-term serious injuries (usually at least 5 months absent) to relieve the pressure on the team's lineup.
source:bong da 7m