Ter Stegen was substituted during the 5-1 victory over Villarreal due to a knee injury.
Real Madrid goalkeeper Thibaut Courtois sent his best to Marc-Andre ter Stegen after the Barcelona keeper suffered an apparent knee injury on Sunday.AdvertisementAdvertisementCourtois, who suffered an ACL setback last year, posted to social media: "I'm sorry about the injury, Ter Stegen, it really hurt me to see you leave the pitch like that.
"I hope you can recover soon and we can see you in goal again."
There's concerns that Ter Stegen has suffered a complete tear of the patellar tendon in his right knee.