According to reports at the weekend, BBC director-general Mark Thompson has made it clear he is determined to cut costs, and senior management has estimated 5,000 staff will be made redundant in order to meet the cost-saving demands of the 10-year Royal Charter in 2006.
The result of the reviews are to be announced in early December this year.
The Observer reported that around 10% of the 28,000 strong workforce could be axed, as well as an extra 1,500 jobs moved out of London.
Radio Five Live is almost certain to move north and BBC Two could also find itself relocated.
There are currently four ongoing reviews at the BBC, which will determine the exact nature of the job cuts.
The first concerns the future of the BBC's commercial arm, BBC Worldwide, which it is considering selling either all or part of. The division incorporates the BBC's books, DVD and magazine businesses.
The second is looking at content supply systems, which regulates who makes programmes.
The third review is considering whether the BBC should move more of its services out of London to cut high rent and rate costs. The final review is examining whether the BBC is "value for money".
A BBC spokesman said: "Any reports about the review at this stage are merely speculative. The results will not be announced until December."
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