The star, 51, was seen tripping up as he walked down some steps in the jungle.
Producers suspected a sprained ankle so whisked him off to hospital to have it X-rayed.
He spent the night in isolation but returned to the jungle on Monday with it strapped up.
An Australian source said: “Crew members wanted to make sure that John was medically safe, but once they saw him walking on it they were hopeful it was just a sprain.
Once that was confirmed by an X-ray he was determined to get back to camp.
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"He’s not a quitter and wants to see how far he can go in the competition. As well as finding it hard he’s relishing the challenge and loving getting to know new people.”
While in hospital John was on lockdown, producers made sure he wasn’t allowed to communicate with family, check his phone or watch TV.
He was given basic food because he missed a meal in camp.
Campmates are said to be delighted to have him back.
John revealed his hopes of a return to the jungle as he sent a message to his camp mates.
He joked: " “I am lying here sipping champagne in a hospital with six male strippers. Continue to live jungle life as normal.
"I want to be back in there with you all soon. But please get some rest this evening. Ps I want my f****** dinner when I get back!”
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