Very low - it's an international break. However, the 6th of October is a matchday, so either we've agreed with the PL that we definitely won't be chosen for a home match on that Sunday, or we've got a contingency plan to play both on the same day...
In a vid a while back the NFL London boss was talking about how Levy had said he wanted to host a football match and an NFL match on the same day. He said that was unlikely, but was up for having the games on the same weekend.