“I don’t think I can put my nerves into a sentence,” Thomson said on Friday.
“I’m 28 years old now but I’m starting my first Grand Tour (race) and it is a dream that’s come true.”
Thomson said the nine-member team, which includes six African riders, had received overwhelming support back home ahead of the three-week cycle race in Spain, which starts with the team time trial on Saturday.
“As a bike rider, to be here at the Vuelta, I really couldn’t ask for anything more.
“The support we have got from back home is crazy.”
Qhubeka will be the first African-based outfit to compete at a Grand Tour event.