Branagh - who cast Hiddleston as Loki in 2011's "Thor" - remembered how he first saw the actor in Othello at the Donmar Warehouse several years prior, reported Digital Spy.
"I saw Tom Hiddleston play Cassio in Michael Grandage's production of Othello, which starred Chiwetel Ejiofor and Ewan McGregor," Branagh recalled.
"I'd not seen him before, but it was quite clear that he was an utterly naturalistic speaker of Shakespeare. It's not necessarily a part in which you can score, Cassio - he is in many ways the relatively straightforward young man...
Hiddleston later appeared opposite Branagh in the first series of BBC One's "Wallander" in 2008 - and the two crossed paths again at the auditions for "Thor".
"He auditioned with a clarity of purpose and a drive... not arrogance, and not over-ambition, but he was just very clear - I felt like I was watching that process happen before my very eyes," Branagh said.