Mattia Binotto says Carlos Sainz's interest strengthens Audi's Formula 1 project.

Binotto said interest from drivers such as Sainz reflects Audi's credibility and potential after the manufacturer completed its takeover of Sauber and entered Formula 1 this season.

Audi has scored points in the past three Grands Prix after an engine update improved driveability in Spain. Discussions with Sainz's representatives have explored a possible move from Williams.