The matches will be on Fox Sports 1 and 2 unless there is some scheduling reason why not. For the qualifiers the big names got on 1 and the lesser names on 2. They tend to skew towards Premier League teams so I would expect us to be on Fox Sports 1 even against that Bulgarian team, unless there is an obvious big game against us.
I don't get 2 but will just upgrade and cancel as and when needed and piss the cable company off. I doubt any of our games will be pushed off those 2 channels. In fact last year they showed reruns of the games (including the ones they didn't pick that afternoon) through the evening and overnight. Fox doesn't have enough products to fill schedules on 2 full time sports channels as it is, the Champions League is the best ratings option they have for midweek afternoons that is for sure.