They could make it really easy and just link team chem to jersey number. Got Moss #84, add Patriots chem and boom! Now he's #81. Given that they already track each players team history (on elite cards at least) adding the correct number associated with those chems should be relatively easy.
Or, as suggested, follow the NHL/HUT model and have jersey # cards and allow the user to customize themselves
They could make it really easy and just link team chem to jersey number. Got Moss #84, add Patriots chem and boom! Now he's #81. Given that they already track each players team history (on elite cards at least) adding the correct number associated with those chems should be relatively easy.
Or, as suggested, follow the NHL/HUT model and have jersey # cards and allow the user to customize themselves