The late Death Wish director - who died last month aged 77 - did not feature in the ceremony's annual In Memoriam tribute.
New York Times reporter Michael Cieply has claimed that snubs may occur if the family of a deceased filmmaker or actor does not campaign for the inclusion as much as others.
Cieply said that "there's no shortage of input from out there in the community", adding that the full list of the deceased is expanded on the Oscars website.
Dallas actor Larry Hagman, actress Phyllis Diller and actor Robin Sachs were also among the stars not featured in the tribute, which saw Barbra Streisand perform 'The Way We Were'.
Cieply also quotes late MASH actor Harry Morgan's son Charley talk about his father's snub at the tribute in 2012.
He said: "I cannot image why it left my dad out of its tribute segment. It would never have occurred to me to check with or otherwise lobby the Academy to be sure that he was mentioned. It's a subjective process."
Michael Winner directed a number of Hollywood movies, including The Nightcomers with Marlon Brando, The Big Sleep with Robert Mitchum and Scorpio with Burt Lancaster.
Watch the In Memoriam tribute below:
Oscars 2013 - 85th Academy Awards ceremony highlights:
Copyright: PA Images Chris Pizzello / AP