This exercise is great for your ankles as it combines up and down movement. You can start performing it soon after pain starts to subside in your ankle.
Sit on a chair and have your leg elevated with foot handing of the bed, chair or something similar.
Bring your toe up and bring it down and repeat at least 30 seconds. Perform range of motion that is comfortable for you, so it is important not to feel any pain during the exercise.