The Star Wars actor will play troubled academic Chip in HBO pilot The Corrections, adapted from Jonathan Franzen's 2001 novel.
"We shot the pilot in 15 days [and] I enjoyed it very much," he told Collider. "If it goes, we'll go back in June and shoot the series for four months in New York."
McGregor admitted that he had initially had some reservations about committing to a television project.
"I did have one week of [saying] 'Oh my God, it's TV... should I do TV?'" he confessed. "[But] after I went over to meet the director and Jonathan Franzen and Scott Rudin, the producer, I was totally in. I just think it's a quality piece of work.
"Having the opportunity to play a character at that length will be really interesting. Over four years... I'll be exploring this guy Chip in that story - it'll be great."
The Scottish star went on to criticise the film industry of recent years for focusing on "branding" and ideas "that we already know".
"Films about people in real situations - it's the [genre] that's taking the biggest kicking after the financial crisis," he suggested. "It just seems in the last three or four years that it's harder to find that kind of drama.
"The big-budget films are about superheroes or fairytales or [they're] kids' films - branding that we already know. I'm always interested in original stuff."
The Corrections traces the troubled lives of an elderly Midwestern couple and their three children, from the 1950s to the millennium. Oscar winners Dianne Wiest, Chris Cooper, Maggie Gyllenhaal and Rhys Ifans will also star in HBO's adaptation.
> Ewan McGregor: 'HBO's The Corrections will be accurate to the book'