Please excuse my silly questions below: http://www.cmegroup.com/trading/fx/g10/euro-fx_product_calendar_options.html#prodType=undefined For the EUR/USD options on futures, there are Oct2010, Nov2010 and Dec2010 contracts. However for the EUR/USD futures, only Sep2010 and Dec2010 contracts are available. Supposing as a seller I now have a short Oct2010 Call options position DITM, is it possible I can get an early assignment for this options contract, as the owner of this Call options really want to excercise it? If yes, since he cannot get any Oct2010 futures which is not available, then what futures contract (Is it Dec2010?) the owner should get instead, and why? Furthermore, how could it be possible that we can trade an Oct2010 options contract which is based on a non-existent Oct2010 futures contract?