With Fernando Torres nursing a knee injury Mourinho had been expected to bolster his forward ranks this month with Samuel Eto’o, a recent hat-trick against Manchester United aside, struggling for form and Demba Ba reduced to the role of bit-part player.
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"Many people don't understand why we don't do [business] but, in the summer, you will understand," said Mourinho, when asked why he hadn’t invested in a striker this month. "No [deals lined up for a striker], but we know what we want."
Meanwhile, Chelsea on Friday confirmed the signing of St Etienne centre-half Kurt Zouma from St Etienne for €15 million.
The 19-year-old has signed a five-and-a-half-year contract with Mourinho's side but will remain with the French club until the end of the season.
Zouma represents Chelsea’s third major purchase of the transfer window having already re-signed Nemanja Matic from Benfica for a fee of €26 million and the Basel winger Mohamad Salah for €15 million.