Jurgen Klopp relied on his Carabao Cup specialists to see off stubborn Preston on Wednesday night but the Liverpool boss admitted he does not know how much longer he can get away with wholesale changes in the competition.
Second-half flicked finishes from Takumi Minamino and Divock Origi put Liverpool through to the quarter-finals after Preston squandered some golden chances before the break at sold-out Deepdale.
Klopp changed all 11 players from the 5-0 demolition of Manchester United on Sunday and it showed as Liverpool were frustrated for long periods by a Preston side sporting nine changes of their own.