Several sources have told Sportsmail that Regina Weber, West Germany’s 1984 Olympic gymnastics bronze medalist, has proved obstructive as City attempt to tie down one of their prized assets.
City have been discussing fresh terms with Sane since last summer with his current deal running until 2021.
The Premier League champions, who declined to comment on the subject on Wednesday, have always maintained they expect the 23-year-old to sign an extension. Sane has also publicly stated that the Etihad Stadium feels like ‘home’.
Sane’s father, the ex-Senegal international striker Souleymane Sane, officially represents him with the help of intermediaries based in England but his mother has become involved in talks.
Sane, a Germany international with 17 caps, has been in and out of Pep Guardiola’s starting XI for a number of months but was instrumental in their 7-0 demolition of Schalke on Tuesday night.
Guardiola revealed Sane’s confidence had dipped ‘a little bit’ while others were preferred ahead of him, but he is still a key player for City with 25 Premier League appearances to his name this season.