A mafia dos sorteios :
1) They added Manchester United to Villarreal's draw pot, even though they could not be paired due to being in the same group.
2) They added Liverpool to Atletico Madrid's draw pot, even though they could not be paired due to being in the same group.
3) They failed to add Manchester United to Atletico Madrid's draw pot, even though that was still a valid draw pairing.
If Man Utd ball wasn't in the pot when Atleti drew Bayern, then that's an issue for United, Bayern, Atleti and PSG, who will all feel that the draw wasn't fair