First of all make sure you stop doing what you were doing.  Don’t injure the area more.

Ice the area, but make sure you have a wet cloth between the ice and your skin as ice can burn. You can use a gentle compression bandage on the area making sure it is not too tight that it cuts off circulation to the foot.

Whilst doing these you can elevate your leg.

If it is really sore and you cannot put any weight on it we strongly recommend you use crutches to help you get about.

As the symptoms improve you should gradually move the ankle so the calf is gently contracting and lengthening.  You should only move it in pain free range and do small amounts regularly.  As you know how it responds you can gradually increase the range of motion and the amount of force you put through it. 

Progress from moving the ankle with no weight on it to going up and down on your toes in sitting to up and down on your toes in standing.  This progression may take several days or weeks to progress through depending on how severe the damage is.  You cannot force the progression but only go as fast as your tissue healing allows.

In order to progress back to sport you must gradually increase the loading you put through the tissue.  It is a common mistake that because you are not getting pain walking you start running and it becomes very painful again.  This is only because it is such a big jump in the amount of force that this tissue is protesting.  If you progress with jumps, then hops and running on the spot you will be able to progress in a much more controlled systematic manner that does not cause any further symptoms.

Disclaimer:  This information is not a substitute for medical advice and you seek professional advice from a doctor, physiotherapist or other healthcare professional.