Razak has joined Anzhi Makhachkala on loan for the rest of the season.
The 20-year-old made his debut for City in the 3-0 Premier League win over West Brom in February 2011.
Razak could face Tottenham in this season’s Europa League.
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.