Sunderland say racist abuse of forward Brian Brobbey on social media highlights the "ongoing and unacceptable frequency of this behaviour".
Police say they are not treating the stabbing as a "random attack".
Paris-Roubaix's remains elite's sport's most volatile journey of daring and dust. And the Hell of the North is the one race legend Tadej Pogacar still can't win.
The incident marks the second time the games giant has been hacked by young, English-speaking hackers.
The singer, who died at the age of 92, will be cremated with full state honours on Monday.