The British star said he had no time for a break between wrapping on the Marvel film and returning to 'Sherlock' and it was a tough task for him to lose weight, reported Digital Spy.
"I finished on 'Doctor Strange' and, that night, I got on a plane. The next morning, I woke up and was driven to Cardiff.
"I was not in 'Sherlock' shape. I was in 'Doctor Strange' shape so I was quite big! I was chunky - in a healthy way, an athletic way - and he's not necessarily, Sherlock," Cumberbatch said.