Since the revelation of the legendary striker's ill health, there has been an outflow of messages of support from clubs, players and fans alike wishing for a full recovery.
Campbell's former Arsenal teammate Ray Parlour posted a message on X, he said: "I hear my ex-team-mate Kevin Campbell is struggling at the moment. All the football family are right behind you, Kev. I know you’re a strong character, mate.
"Stay positive. I’m sure everyone is on your side trying to help you. Hopefully, you get well soon mate and you’ll be back flying as usual."
Former England star Trevor Sinclair said: Sending prays, love & light to Kevin Campbell. Absolutely lovely human."