When best-laid plans go awry, football managers are often forced into finding creative solutions to unforeseen problems.
Centre-backs as strikers, full-backs in goal - and generally putting square pegs in round holes.
Red cards, injury issues and tactical tinkering have all given rise to some left-field player selections at Liverpool down the years, with varying degrees of success.
We've gone through the archives and picked out 10 occasions when Reds have been deployed in emergency roles.
1. Jose Enrique - Goalkeeper
There's something captivating about the moment an outfield player goes in goal: the bizarre spectacle of an unusual figure between the posts and the anticipation of that first shot they have to face.