Colombian is Mourinho’s first signing in January.
Juan Cuadrado has completed his transfer to Chelsea from Serie A side Fiorentina for £27 million.
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Cuadrado flew into London on Saturday for his medical with the Blues after Fiorentina coach Vincenzo Montella confirmed the transfer was taking place on Friday.
Mohamed Salah will leave Stamford Bridge as part of the deal and join the Serie A team on-loan for the remained of the season.
Cuadrado himself actually already confirmed his arrival in London prior to Chelsea’s 1-1 draw with Manchester City on Saturday, tweeting: “Hello from ‘The Bridge’.”.
Hello from “The Bridge” pic.twitter.com/h1VZfvAGXs
— Juan Cuadrado (@Cuadrado) January 31, 2015
The Colombian winger joins Jose Mourinho’s side after two and a half years in Serie A, and so far this season the 26 year old has managed four goals and four assists in 17 league appearances.
His time with Fiorentina follows spells at Udinese and Lecce in Italy after moving from Colombian side Independent Medellin to Europe in 2009.
The versatile South American can play in various roles including midfield, full back or even as a wide forward.
Cuadrado will surely find it easier to get a game with the expected departure of forward Andre Schurrle to Wolfsburg set to be confirmed in the coming days.