Looking at various forecasts it looks like we could be in for a plus 30C day on Monday. Which means keeping hydrated and not overheating is going to be an issue. If you haven’t packed some already, energy drinks with electrolytes could be a useful thing to make sure you have.
Last year I found myself cramping on the Lautaret due to getting depleted on that side of things. This year, with the tougher course etc, they are going to be just as important.
But don’t forget the wind/rain jacket for descending as it can get a bit fresh when the sweat is being chilled at 65km/h.