The Care and Support Minister Norman Lamb has said that the Care Quality Commission (CQC) will implement a "tough series of checks" on the largest care companies - including those that provide care in people's own homes.
The move will give "early warnings" if a company is in trouble, he said.
The CQC will have power to require regular financial and relevant performance information from the 50 to 60 largest companies, and providers will also be forced to submit "sustainability plans".
And if a company is in trouble the CQC will have power to commission an independent business review to help the provider to return to financial stability.
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Five people were killed and dozens more were injured after a car and knife attack in the capital on Wednesday afternoon.
Among those expected to attend the ceremony will be former US President Bill Clinton and ex-Northern Ireland first minister Peter Robinson.
Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.