The direction has now said that Ewan and his other co-stars Jonny Lee Miller, Robert Carlyle, and Kelly Macdonald are all keen to reprise their roles as Renton, Spud, Franco and Diane respectively.
However, he admitted that the actor’s busy schedules are causing a bit of a problem.
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Ewen Bremner, Robert Carlyle, Ewan McGregor and Jonny Lee Miller
Robert is currently starring in ‘Once Upon A Time’ as Rumplestiltskin, while Johnny is playing Sherlock Holmes in ‘Elementary’.
‘Trainspotting’ was adapted from Irvine Welsh’s 1993 novel of the same name and tells the story of a group of heroin addicts, living in a bleak 1980s Edinburgh.
The author later published a sequel, ‘Porno’, in 2002, which picked up where the film left off, including elements of the storyline that did not feature in the first book.
Details about the sequel’s plot and who it will be penned by are currently unknown, but we have mocked up what the characters may look like 19 years on from their first adventures together below...
Ewan McGregor starred as Renton... (credit:c.Miramax/Everett/REX)
(02 of18)
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'Trainspotting' brought Ewan McGregor worldwide fame, and marked the start of a huge career in cinema. In the years since playing heroin addict Mark Renton, Ewan has starred in 'Star Wars', 'The Impossible' and opposite Nicole Kidman in 'Moulin Rouge'. In July 2015, he began preparing for a role in the live action remake of 'Beauty And The Beast'. (credit:Chris Pizzello/Invision/AP)
(03 of18)
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Ewen Bremner starred as Spud... (credit:c.Miramax/Everett/REX)
(04 of18)
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Scottish actor Ewen went on to star in 'Snatch' and 'Black Hawk Down'. He now has a daughter, who is named after a film director, and has reportedly already signed up for the 'Trainspotting' sequel. (credit:Jordan Strauss/Invision/AP)
(05 of18)
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Shirley Henderson starred as Gail... (credit:Ron Galella via Getty Images)
(06 of18)
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Shirley went on to star in another Irvine Welsh adaptation, appearing as Bunty in the 2013 film 'Filth'. Movie fans will also recognise her as Moaning Myrtle, from 'Harry Potter'. (credit:Joel Ryan/Invision/AP)
(07 of18)
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Robert Carlyle starred as Begbie... (credit:Everett Collection/REX)
(08 of18)
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The year after 'Trainspotting', Robert went for something a little lighter, starring in the cheeky 'The Full Monty'. Since then, he's popped up on our screens a number of times, and currently stars in the US TV show 'Once Upon A Time'. (credit:Kevin Parry/Invision/AP)
(09 of18)
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Kelly Macdonald starred as Diane... (credit:Moviestore Collection/REX)
(10 of18)
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In 2012, Kelly popped up in 'Anna Karenina', punctuating her four-year long, award-winning stint in 'Boardwalk Empire'. Her other credits include 'Gosford Park' and 'No Country For Old Men'. (credit:Charles Sykes/Invision/AP)
(11 of18)
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Jonny Lee Miller starred as Sick Boy... (credit:c.Miramax/Everett/REX)
(12 of18)
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Jonny married Angelina Jolie just weeks after 'Trainspotting' was released, however the couple split 18 months later. Ange still speaks favourably of the star, and insists that they remain friends. Career wise, Jonny hasn't done too shabbily at all, starring in films and venturing onto the West End stage and Broadway, in productions of 'Frankenstein' - for which he bagged an Olivier Award - and 'After Miss Julie'. (credit:Star Max/IPx)
(13 of18)
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Irvine continues to write novels, scripts and short stories. In 2002, he released 'Trainspotting' sequel 'Porno', and returned to the characters again for prequel 'Skagboys', which charted Renton's fall into addiction, in 2012. (credit:Kaveh Kazemi via Getty Images)
(14 of18)
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Irvine Welsh wrote the book(!) and made a cameo as Mikey Forrester... (credit:Fred Duval via Getty Images)
(15 of18)
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Kevin McKidd starred as Tommy... (credit:Moviestore Collection/REX)
(16 of18)
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From 2008, Kevin's been a huge hit on the 'Grey's Anatomy'. Between 'Trainspotting' and landing the role of Dr. Owen Hurt, he landed roles in Ridley Scott's 'Kingdom Of Heaven', TV series 'Rome' and even lent his voice to a character in the game 'Call Of Duty'. (credit:Richard Shotwell/Invision/AP)
(17 of18)
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Eileen Nicholas and James Cosmo starred as Mrs. and Mr. Renton... (credit:Moviestore Collection/REX)
(18 of18)
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Eileen and James starred as Ewan's on-screen parents, and both actors are still in the entertainment industry. In 2011, Eileen popped up in an episode of 'Law And Order', and in 2016, she'll star as Ellie Frampton in the film 'Synced'.James has popped up in basically everything, including the reasonably well-known fantasy show 'Game Of Thrones'. (credit:Ruth Crafer/Duncan Bryceland/REX)