Christian Horner believes there must be a "fundamental" difference between Lewis Hamilton's contract demands and what his Mercedes team is willing to offer.
The seven-time world champion's renewal talks have become the saga of the Formula 1 season so far. What was once seen as a formality has dragged out for longer than anyone anticipated.
Before last month's Canadian Grand Prix, Mercedes chief Toto Wolff suggested an agreement could be "days" away. But that turned out not to be the case.
