He said Cumberbatch jumped out of the car and grabbed one of the attackers.
“I had hold of one lad and Benedict another,” Dias was quoted as saying. “He seemed to know exactly what he was doing. He was very brave.”
“Here was ‘Sherlock Holmes’ fighting off four attackers just round the corner from Baker Street,” he added.
The fictional detective’s home address in London is around the corner from the scene of the attack.
Cumberbatch’s spokeswoman declined to comment.
The newspaper didn’t say when the incident occurred. Police said a delivery cyclist was assaulted in the street in November.
On Saturday, Deliveroo praised Cumberbatch “for his heroic actions.”
“On behalf of everyone at Deliveroo: Thank you so much,” it said.