Regardless of whether we beat Madrid or not, there's nothing stopping us playing who we like on Sunday. After playing 4 games in 14 days and with all the traveling we can easily claim fatigue etc.
And even if we didn't get away with it, what punishment will we get? A suspended fine like Wolves got.
I would not be surprised to see a suspended points deduction should liverpool field a joke side next weekend in all seriousness.