Royal Bank of Scotland Group, Britain's biggest government-owned lender, will signal next week it plans to sell a 15% to 25% stake in Citizens Financial Group in Providence, R.I., according to a person familiar with the plan.

No deal is imminent and the process will likely take about two years to complete, said the person, who asked not to be named because they were not authorized to speak publicly on the matter. RBS (RBS) will announce the move when it reports full-year earnings on Thursday.

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