David Shrigley said that because his often darkly humorous art can be "juvenile and comic" he will not claim the prestigious prize this year.
Shrigley, who has unveiled his show for this year's Turner Prize in Derry-Londonderry, said he thinks fellow nominee Tino Sehgal will claim the prize.
However, if Shrigley, who trained at Glasgow School of Art, wins the £25,000 prize he will be the seventh Scotland-based or trained artist to win since 1996.
The four artists shortlisted for this year's prize unveiled their displays yesterday.
However, Shrigley said the comic aspect of his display, a three-metre high animatronic 'Life Model' which occasionally blinks and urinates into a metal bucket, although made with serious intent, may mean he will not take the award.
Shrigley, who is largely known for his popular and darkly comic drawings and sculptures, said he wanted the people of the city to be able to interact with the work - chalks, pencils and paper are provided so that people can draw the model.
His fellow nominee, the painter Lynette Yiadom-Boakye, has also drawn the figure and her sketch of his work is on the wall of the show.
Sehgal, who won the best artist prize at the Venice Biennale this year, has an unusual entry: in an empty room, gallery assistants offer to pay you £2 if you will discuss the 'market economy.'
Laure Provoust presents two film works in another room of the exhibition, which is being held at a former British army barracks in the city.
In Shrigley's work, a computer in the model's head controls its eyes and a tube from a reservoir inside its base allows water to enter the body.
Shrigley said: "I chose to show it because of the scale of it. It's quite a big work, and in terms of the Turner Prize, there has to be something to talk about, whereas a lot of my work tends to be quite small and self-contained.
"Because he is a life model, I wanted him to be kinetic: he is a very good life model because he doesn't move.
"He is also really badly proportioned."
He added: "It is an acknowledgement that he represents a living person, so I thought 'what can we recreate without massive technical challenges?'
"So I started with the blinking and then I was like 'can we make him pee as well, into a bucket?'
"And it gives it a really juvenile, comic element, and that is part of my work, that kind of stupid comedy.
"But I hear him peeing in the bucket, in my mind, and I think: 'I am not going to win the Turner Prize.'"
Shrigley was shortlisted for the prize for his recent shown ast the Hayward Gallery in London, Brain Activity.
The winner of the prize is to be announced on December 2.
However, Shrigley does not seem to think he has a chance.
He said: "I think its very uncomfortable, the competitive element. It's not really what you normally experience, except for when you are at Art School and you get a mark for your degree.
"I don't think any artist wants that. If you asked Laure or Tino or Lynette, they would give you the same response.
"Apparently Lynette and Laure and I stand zero chance of winning, so that makes it easier. If you believe the commentators, it's only Tino Seghal that will win. I tell people I am shortlisted with him and people say 'Oh, that's a shame.'"
Scottish artists have somewhat dominated the prize in recent years.
Martin Boyce won in 2011, following Susan Philipsz in 2010 and Richard Wright back in 2009.
Past winners with links to Scotland also include Simon Starling, Martin Creed and Douglas Gordon.
Derry-Londonderry is currently celebrating being the first UK City of Culture.
Ebrington, where the show is being held, has been transformed from a barracks into a gallery for the show.
Dundee is among the finalists to be a UK City of Culture, and will find out in November if it has succeeded.