Performance in the league generally cannot be seperated from performance in the CL. In the last 10 years only one team won the CL without being competitive in their league and that was Chelsea. Teams like Liverpool get found out because they come up against teams that have quality through out the team. If United and Chelsea can hold Liverpool to a draw at Anfield, then better teams in Europe will fancy their chances there. As further evidence of Liverpool's level, Liverpool had one of the easiest groups in the CL, but had the 2nd lowest points total for first place. The only other group with a lower points total for 1st place was one of the toughest groups which had Chelsea, Atletico and Roma.