It's a general rule of thumb that January signings are more risky than summer ones: players have less time to adapt, prices become artificially inflated as clubs tend to be more desperate midway through a season and negotiations can often be rushed. Last January, some of the biggest deals were disastrous: Juan Cuadrado moved from Fiorentina to Chelsea for £22million, played just a handful of games and moved back to Italy the following summer. And Wilfried Bony has not justified the £28million fee that took him from Swansea to Manchester City.