Laura Trott has revealed that she promised to buy her sister Emma a car if she won two golds at the Games.
Giggling, Trott told BBC Breakfast: "I hope she's got a budget, there'll be no Ferraris, I'm telling you."
Talking about the future as she appeared on the sofa with six-time Olympic champion Sir Chris Hoy, Trott joked: "I could beat him, eh?"
More top news
Supermarket website glitches have caused problems for shoppers who ordered their Christmas food delivery online.
Big Brother and Celebrity Big Brother were the most complained about programmes on British television this year, according to Ofcom.
A mild start to the Christmas week across many parts of the UK, rain spreading southwards over the next few days.