This depends on how badly you have jammed it. Usually if you can still get movement out of you finger you caan immediately return to your sport but you may want to tape it or get a splint. If you can't get any movement out of your finger I suggest going and getting X-rays because it may be fractured or even broken. Hope this helps! :)
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I would wait until you are able to do things with it normally without feeling pain or discomfort, or if it is constricted with a bandage during physical activities.
It depends on how bad the injury is and your position. If you are a lineman it would be okay.
It's not recommended but if you keep it taped up with a splint and try not to have in the firing line too long it should be fine :)