We're into the final days of the 2014 summer transfer window. Liverpool have signed nine players so far, adding much-needed depth to Brendan Rodgers' squad.
Only time will tell how many of those signings prove to be a success.
There is a theory, devised by football writer Paul Tomkins, that only 40 percent of transfers succeed. No matter the club or manager, there is no guarantee of a transfer working out. So many aspects come into play and sometimes circumstances dictate otherwise.
Thankfully, for every transfer failure, there are incredible signings at the other end of the spectrum that result in huge success and often huge financial gain—see Luis Suarez signing for £23 million and being sold for £75 million.
Nonetheless, here are five of Liverpool's worst summer (not January window) transfer deals of the last 10 years.