Norton suffered an injury to his meta-tarsel bone in his foot and was advised by medical staff that he would not be fit to take to the floor in Latvia.
In his place, Owen Odigie has been flown in to replace Norton in the line-up.
Odigie, an AIS scholarship holder who hails from Victoria, is a strong athlete and comes into the series off
Odigie was a member of the Emus team that qualified for the World Championship with a victory over their New Zealand counter-parts in September 2010.
The FIBA U19 World Championship of Basketball tips off 30 June.