Not really a lot of disconnecting and re-connecting. Disconnect during each half and re-connect at halftime. I don't think the site would be a major problem,, but if you were a professional player in a full contact sport like Rugby (or similar) you could simply put in a new set each time.
The whole point about wearing a ;pump if you are an athlete is the ability to cut the basal well in advance making hypos during play much easier to evade. The last thing you want is a whole load of long-acting insulin working away during the game!