Steven Moffat has one clear criterion for casting the new Doctor – and it's a pretty simple one.
"Just choose the best person for the job and any other agenda, however worthy, should be ignored. It has to be the best person for the Doctor that Chris is writing for," Moffat explained.
"Chris is going to be working with the actor for quite a few years and it is a pressure cooker. It can be tough, so you need to choose your friend wisely. So long as it works for the good of the show, that's fine."
Like Moffat, Chibnall will be coming into the show with a brand new lead and, as Doctor Who tradition states, he'll be writing the new Doctor's first lines in this year's Christmas special.
"We had a laugh about it – I said to Chris he would get a minute at the end of the episode," Moffat teased.
When Chibnall does join, he'll at least have an established companion in the form of Pearl Mackie's Bill Potts – who recently revealed that she was told not to watch any old episodes before working on the show.
"I initially planned to watch all of Peter [Capaldi's] stuff with Jenna [Coleman], so I could see what he was like as a Doctor, and they were like, 'Don't watch it'," she recalled.
Doctor Who returns to BBC One on Saturday, April 15.
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