When to return to play after an ankle sprain.?

Depends: A bad ankle sprain can take 6-8 weeks to rehab. Physical therapy is the key to a good outcome. Don't risk long term instability. Rehab the injury and the pt will let you know when you can go back to sports.

Progressive return: Once your pain & swelling is under control, you regain full range of motion & strength... You can use a home exercise program in many cases (band exercises, stretching, and balance) to help with the early stages of recovery, but as you return to sport (w/ brace) you should make sure you are able to perform the basics, before you try to fully practice/ play. If pain persists see md & have an x-ray.