“And then when I said that I thought I could, he talked to the casting director Nina Gold, who informed him that I was already on the list.
“They fortunately had the same thought. Not quite sure why, but I’ll take it as a compliment,” she told the BBC Radio 2 show.
Anderson has previously discussed working with her partner.
“For our sanity, and actually for the benefit of the relationship, we had very clear boundaries: ‘I am not going to comment on the script, but you are not allowed to comment on the performance,’” she told Harper’s Bazaar.
Gillian Anderson reveals how she was cast in The Crown