Sir Geoffrey Boycott is “unable to eat or drink” after developing pneumonia following cancer surgery, his daughter Emma has said.
The cricket legend, 83, had a procedure to “remove his throat cancer” on Wednesday.
Following the three-hour operation, the surgeon reported it “went well”, Emma Boycott said.
He was discharged on Friday with “lots of pain meds and a liquid only diet for the foreseeable”.
Her father was “on the mend”, Ms Boycott said, and looking forward to watching England play the West Indies and the Open golf.
But in a further update on X on Sunday afternoon, she said: “Unfortunately things have taken a turn for the worse and my father has developed pneumonia and is unable to eat or drink.”
That means he is “back in hospital on oxygen and a feeding tube for the foreseeable”.
She added: “Thank you all for the well wishes, we’ve been blown away by the sheer number of them.”
Sir Geoffrey revealed a second diagnosis of cancer earlier this month after undergoing extensive chemotherapy in 2002.
The former Yorkshire and England batsman scored 8,114 runs in 108 Tests for his country – including 22 centuries – between 1964 and 1982.
He amassed 48,426 first-class runs in total across two decades.
When his international career ended he was the leading Test run scorer and was awarded an OBE for services to cricket.
After retiring in 1986 he spent 14 years working on the BBC’s Test Match Special.