The 26-year-old opening batsman, who was named one-day captain last year, led his team to victory over Hyderabad XI in England's final warm-up match ahead of the start of the one-day international series against India.
Spinner Swann has said that despite Cook's "outstanding" leadership skills in the squad, the Essex cricketer struggles when it comes to motivating the team.
"He was understandably nervous for his maiden series as official captain against Sri Lanka last summer but his leadership was outstanding - apart from team talks," says Swann in his autobiography The Breaks Are Off.
"He stumbles and stammers a lot and is renowned for starting one sentence and jumping into another before he has finished. I stare at the floor in a bid not to laugh."
Meanwhile, England take on India for their first one-day match on Friday.