"I would never have dreamt such a thing would happen in my career", Millar told reporters after the route of the Tour's 94th edition was officially unveiled on Thursday.
"It is an opportunity for me to show this sport to my family and my friends, but also to show why I love it."
Millar, who won the Tour's prologue in July 2000, was banned for two years and stripped of his gold medal from the 2003 world championship time trial after he admitted taking the banned blood-booster EPO in 2001 and 2003.
Tour de France
Landis claims deal offer
11/05/2007 AT 09:17
"I will build my season on this prologue. I will take benefit from what I've learnt in track cycling," the Scot said.
"Track cycling gave me speed so I think I can go faster now."
Tour de France
More trouble for Landis
23/04/2007 AT 13:50
Tour de France
AFLD drop Pereiro case
25/01/2007 AT 18:52