The Cameroon striker has failed to net for the Blues so far this season but is set to get a chance in the first team with Fernando Torres out injured for three weeks.
Mourinho managed the 32 year old at Inter Milan when they won the Champions League together, but the initial sights at Chelsea are way off of that.
The Chelsea boss doesn’t know what happened to Eto’o in Russia but is convinces that his man can find his best form in the near future.
“The player I know, the professional I know…what happened in Russia in the last two-and-a-half years I didn’t know,” said Mourinho.
“Normally when a top player is one of the top players in Europe and then goes to Anzhi the pressure goes down, the motivation and physical condition and sharpness goes down.
“Now he’s back in top European football and needs a bit of time to find that sharpness. He’s playing a lot. He played 80 minutes this week and he is getting his form and an understanding of where he is.
“But the Premier League is a different picture. So give him a little bit of time.”
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