The Birmingham Oratory has said his body had probably decomposed because his coffin was not lined with lead.
But a forensic archaeologist at the University of Birmingham has questioned this.
Professor John Hunter tested soil samples from close to the grave and said they would not, in normal circumstances, have led to the complete decomposition of Newman's skeletal remains.
Cardinal Newman was revered during his lifetime as a priest, theologian and writer.
He was born in London in 1801 into a Church of England family and was ordained in the Anglican Church but converted to Catholicism at the age of 44.
He settled in Birmingham where he founded the first English Oratory and was known for his work with the poor. He died in 1890.
The Vatican is currently considering the claims of a deacon from the US Diocese of Boston, Massachusetts, that he was cured of a spinal disease through a miracle after praying to Cardinal Newman.
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