Just have to hope that the draw is unkind to them or at best they come second in the group so are away in the 2nd leg of the first knockout against a Bayern or Real. The second leg at Anfield is too big of an advantage for them if they get to the quarters. Over two legs of the second leg is at home they could take anyone. Top sides think a single goal or two goal lead is enough and then get blitzed in a mad spell. Hopefully they end up in a group with Juve as champions and Barca from pit 2.
Even if they make 3rd they are highly likely to face a tough group: The current projected teams who will be seeded above them are:
Title Holders (Leicester or any of the other 7 ranked are above Liverpool)
Spain - Real Madrid, Barca, Atletico Madrid, Sevilla (one via Qualifiers)
Germany - Bayern Munich, Dortmund (possibly Dortmund via Qualifiers)
England - Chelsea, Spurs, City, United (possibly) (City or Liverpool via Qualifiers)
Italy - Juve, Napoli
Portugal - Benfica, Porto
France - PSG, Monaco
Russia - Zenit (possibly)
Ukraine - Shaktar, Dynamo Kiev
Belgium - Anderlecht
Holland - Ajax
Turkey - none probable
Swiss - Basel
also - Olympiakos (Qualifiers)
That's as many as 23 ranked higher than Liverpool. This puts them in Pot 3 basically..