Tom Parker, 33, called for his fans to "light a candle and say a prayer" for him on Wednesday.
The Wanted singer explained to his 267,000 followers on Instagram how the date, 2nd February 2022, was "a powerful day to manifest" and heal.
Tom - who was diagnosed with a brain tumour in 2020 - went on to share an affirmation that included the line: "May my body return to health and completely free from dis-ease."
