"I think it's very sad", he said.
It was announced last week that 58-year-old Spacey would be cut out of Ridley Scott's latest biopic, which would have seen him take on the role of oil tycoon J. Paul Getty. "It's so sad, it's such a shame, and that's all I can say".
Speaking on the red carpet at the premiere for his new film The Man Who Invented Christmas, Plummer told ET of the claims of sexual harassment being made against Spacey: "The situation is very sad, because [Spacey's] such a talented guy".
The film was set to be released next month and there were questions about how this timetable could be kept while pulling an actor completely out of the movie only to put another into scenes already shot. Rumor has it the Spacey-Plummer switch will cost Sony an additional $10 million. "The whole circumstance is sad", he added.
Plummer, 87, told Confidential on Sunday that he understands the fascination around the abrupt and highly unusual recasting but "I'm used to big roles and lots of words". I admire Ridley Scott and I'm thrilled to be making a movie for him. And so I thought, that was it. Ages ago I was in contention for [the role], way back. "But if I did behave then as he describes, I owe him the sincerest apology for what would have been deeply inappropriate drunken behavior". "I'm very saddened by what happened to Kevin, but what can I do?" I wanted to work with him.
"It fascinates me because it's very clear and very well-written", he continued. The script was wonderful. Plummer begins re-shoots on November 10 and will shoot for 10 days straight in Rome and London.
And Plummer's not the only person feeling sorry for Spacey - Vanity Fair also quoted writer Gay Talese defending the American Beauty actor at the Library Lions Gala in New York's Public Library, an event to honour writers. "It's worth getting a go".
In a shocking move, Scott made a decision to pull the thriller amidst the allegations of sexual assault and harassment involving Spacey and re-shoot the scenes with Plummer with the co-operation of stars Mark Wahlberg and Michelle Williams.
And as for "The Man Who Invented Christmas", in which Plummer plays Ebenezer Scrooge, the Canadian-born star says he loved playing a cantankerous character - and is quite cantankerous in real life.
Bill Gates Invests $80 Million in Arizona to Build a Smart City
A real estate investment firm owned by Gates recently bought a giant plot of land in the far west Valley for $80 million. Although the housing crash put a damper on the city's development, the regional real estate market has since recovered.