Bertrand made his Premier League debut on 20 April 2011, when he came on as substitute to replace Ashley Cole in a 3–1 win against Birmingham City.
Bertrand also made a goal, providing a cross which Florent Malouda headed past Birmingham goalkeeper Ben Foster.

On 15 July 2011, Bertrand signed a new four-year contract with Chelsea.

He was used as a back-up to Cole by Chelsea manager Carlo Ancelotti, as he remained with Chelsea and left back Patrick van Aanholt went out on loan.
Six years after signing for Chelsea as a schoolboy, Bertrand made his first starting appearance, against Fulham in the League Cup.
The match finished in favour of Chelsea, who won on penalties 4–3, as the match ended goalless.
Bertrand made his Premier League debut on 20 April 2011, when he came on as substitute to replace Ashley Cole in a 3–1 win against Birmingham City. Bertrand also made a goal, providing a cross which Florent Malouda headed past Birmingham goalkeeper Ben Foster.
On 15 July 2011, Bertrand signed a new four-year contract with Chelsea.
He was used as a back-up to Cole by Chelsea manager Carlo Ancelotti, as he remained with Chelsea and left back Patrick van Aanholt went out on loan. Six years after signing for Chelsea as a schoolboy, Bertrand made his first starting appearance, against Fulham in the League Cup. The match finished in favour of Chelsea, who won on penalties 4–3, as the match ended goalless.
Ryan Bertrand