Junior time trial world champion Elinor Barker replaces Joanna Rowsell in Britain's line-up for the Glasgow round of the UCI Track World Cup this weekend.
Barker joins Olympic gold medallists Laura Trott and Dani King at the Sir Chris Hoy velodrome to contest the women's team pursuit.
Joe Kelly has also been drafted in to replace Steven Burke in the men's endurance line-up.
"It's a fantastic opportunity for these two youngsters to step in and experience the GB competition environment at an elite level," said GB performance director David Brailsford.
No reasons were given in British Cycling's statement for Rowsell and Burke's non participation.
The Glasgow round of the 2012-13 UCI Track World Cup takes place from Friday November 16 to Sunday November 18. The event will host Olympic team pursuit gold medallist Ed Clancy's debut in the team sprint alongside Philip Hindes and Jason Kenny.
Cycling Weekly will be covering the Track World Cup with daily online updates.
Great Britain's revised team for the Glasgow Track World Cup
Men's sprint
Ed Clancy
Philip Hindes
Jason Kenny
Women's sprint
Becky James
Jess Varnish
Men's endurance
Jon Dibben
Owain Doull
Sam Harrison
Joe Kelly
Andy Tennant
Simon Yates
Women's endurance
Dani King
Elinor Barker
Laura Trott
Related links
Clancy joins sprinters for Glasgow World Cup
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