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The 42-year-old, who was recently taken into hospital to undergo tests, has been working as the East Anglian club’s Under-23 boss since October 2020.
A subsequent statement from the League One club on Sunday said he had been diagnosed with primary sclerosing cholangitis and now requires a transplant.
Dyer said: “Unfortunately, I was diagnosed with a condition of the liver a couple of years ago, that would lead to me one day needing a transplant.
“Over the next week, test results will confirm when I need to go through this procedure.
“I see myself as a very positive person that will overcome this minor setback. I’m very grateful to the club, the supporters and the general public for their messages of support over the past week.
“I would like to ask everyone now to respect my privacy, and my family’s privacy.”
Dyer, who won 33 senior England caps, started his career with Ipswich before going on to play for the likes of Newcastle before moving to West Ham in 2007.
Additional reporting from PA