Abbott -- a London-born staunch monarchist who lost his job as prime minister in a party coup two weeks ago -- was heavily criticised for bringing back the knights and dames honours list in March last year.
He faced further ridicule, including from MPs within his own conservative Liberal Party, when he decided in January to award the Duke of Edinburgh the Order of Australia.
"Obviously, it was an injudicious appointment, obviously," Abbott told Melbourne radio station 3AW.
He would not respond to a question on whether Queen Elizabeth II had asked for the honour to be awarded to her husband.
At that time, the knighthood gaffe piled pressure on Abbott -- who was already slipping in the polls -- and a month later he faced the first of two party-room efforts to topple him. Malcolm Turnbull was successful in the second attempt in mid-September.
The multi-millionaire former barrister and banker, who entered public life when he chaired the Australian Republican Movement during a 1999 referendum on the monarchy, is expected to be supported in cabinet with a proposal to remove the royal titles.
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