Madrid, Aug. 5 -- The relationship between FC Barcelona and goalkeeper Marc-Andre ter Stegen continues to worsen, with the club opening disciplinary proceedings against the goalkeeper.

Barca has taken the move after Ter Stegen reportedly refused to sign a medical report the club was going to send to La Liga's Medical Commission over the 33-year-old's back injury.

Ter Stegen had an operation on his back last week, with the goalkeeper posting on social media that he expected to be out of action for around three months.

However, Barcelona's medical report estimates he will be sidelined for five months. The difference is vital to Barcelona, because if La Liga accepts Ter Stegen will be out of action for over four months, the club would be...