American football players have worn the jersey number 45?
He is number 21
Fortmann, Friedman, Sanders and Thorpe have worn jersey #21 in football.
Ronaldo wears jersey number 9 at Real Madrid.
No, it is not possible to wear the number 0 on a football jersey. However, the 0 jersey was issued in the NFL before the number standardization in 1973.
His number is 74.