Samuel Eto'o has yet to adjust fully to life in the Premier League with Chelsea, Blues boss Jose Mourinho said on Friday.
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Eto'o is still looking for his first goal for the London club following his August move from Anzhi Makhachkala.
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The Cameroon striker, 32, is expected to lead Chelsea's attack at Norwich this weekend in place of Fernando Torres, set to be sidelined for three weeks with a knee ligament injury.
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If Eto'o is involved from the kick-off at Carrow Road on Sunday, it will be his third league start and his fifth appearance for Chelsea in all competitions Mourinho, speaking to reporters at London club Chelsea's Cobham training ground on Friday, said the forward had lost sharpness as a result of playing in Russia.
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"The player I know, the professional I know...what happened in Russia in last two-and-a-half years I didn't know," added the Portuguese who had Eto'o in his Inter Milan side that won the 2010 Champions League.