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.
According to the official site of USC Trojan Athletics, there is no football player that wears the jersey number 5.