Toulouse - Yellow jersey holder Team boss says Ineos on course for Tour de France title
"I am happy to be doing a sprinter's stage (Wednesday) with the yellow jersey and that should give me another day in yellow as long as there isn't a glitch," said Alaphilippe.
"But I know that the Pyrenees are coming and the time trial.
"I know that it is not my strong point but I have improved and worked hard on it. I am not going to challenge the best time-triallers but I will give everything as usual.
"With this type of course and with the yellow jersey on my back, if I still have it, I hope to spring a surprise."
Alaphilippe has never been considered a genuine contender for the general classification.
The Deceuninck-Quick Step rider is eager to hang on to the fabled jersey, which is celebrating its 100th year as the overall leader's livery, for as long as possible.
"For the moment I will continue to defend it and honour it.
"I hope to surprise myself, do something beautiful but I am not going to dream.
"The most difficult part is still to come. What I have done, though, is already incredible.
"Even if I recognise what is going to happen, when you wear the jersey and you are French, the whole of your country feels it and dreams."