Jack Wilshere wore jersey number 7 in the 2014 FIFA World Cup.
I'm not sure but I think it is to honor Jack Tatum, the hard hitting safety of the 1968 National Championship Team. Tatum passed away recently.
This is for Jack Tatum who recently died. He played for the raiders.
He wore No.4 on his jersey.
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.
Jersey # 17