Sangster, you may recall, was the lad who starred in the Richard Curtis film comedy Love Actually, where Liam Neeson played his stepdad and his leading co-stars were Emma Thompson and Bill Nighy (who, actually, walked off with the picture).
Anyway, Sangster, who possesses mesmerising eyes, was good in the movie.
Soon after, he did Nanny McPhee, starring again with Emma Thompson, and that was also a hit.
At the end of this month, he begins working with Oscar-winning director Jane Campion on her film Bright Star, a love story with Ben Whishaw and Abbie Cornish portraying John Keats and his lover Fanny Brawne.
Sangster's London agent refused to respond to multiple telephone messages.
However, on the agent's website there's chatter about Sangster being in the middle of his A-levels but that, despite this, he would be flying "to LA for preproduction of his next project . . . watch this space".
Spielberg's spokesman Marvin Levy said he couldn't comment on Sangster because the film's production team weren't available.
An executive who worked with Sangster in Los Angeles recently told me: "Thomas seems to be the one.
"He was just great, but I'm not certain if anything has been finalised yet."
Filming on the first story involving Tintin begins in the autumn, with Spielberg directing. Peter Jackson will make the second movie.
I've heard various tales about the third film: some say Spielberg and Jackson will direct it together; others claim that James Cameron, who made Titanic, will be at the helm.
Last night, everyone involved was in lockdown.