The 27-year-old has joined FC Rostov on loan until January.
Bentley has failed to make the expected impact at Tottenham since joining the club from Blackburn in a £15million deal in the summer of 2008.
Bentley had a spell on loan at West Ham last season.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.