Lucas Torreira is currently out on loan at Atletico Madrid, so the No 11 is vacant.
Odegaard also wore that shirt at times with Real’s Castilla team.
Odegaard is unlikely to want or be given the No 4 and No 5 shirts.
So after 10 and 11, No 26 is the lowest number he could choose.
It was the number he was given at Real for the 2016/17 season before he got sent out on loan.