The European Banking Authority and the UK's Financial Conduct Authority have been in contact with Google over the major cloud outage earlier this week that knocked out several bank websites.
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The EBA has asked Google for information on the incident as it seeks to understand the implications, according to Reuters. The FCA says it is also engaging with the US tech giant.
Google Cloud services were disrupted for around six hours on Tuesday after an electrical power interruption at a UK data centre facility serving Western Europe. The incident affected a host of clients, including major banks such as Lloyds, HSBC and Revolut. Customers reported issues with logging into apps, card payments and ATM withdrawals.
While banks are ultimately responsible for services that they provide to their customers, both the EU and UK have recently moved to strengthen oversight of critical cloud providers.
Last year, Google Cloud was one of thirteen technology suppliers that the EBA authorised in-depth examinations of after they were deemed to be providing critical services to the financial services community.
In July, the UK government put the four biggest cloud service providers - Amazon, Google, Microsoft and Oracle - under direct oversight by the FCA, Bank of England and Prudential Regulation Authority.
Economic Secretary to the Treasury and City Minister, Rachel Blake MP, said at the time that "these designations will help ensure the critical services financial firms rely on remain resilient, protecting consumers and businesses while supporting growth across the economy".
The Treasury Committee has now written to the BoE and FCA seeking details of their response to the Google outage, the scale of the disruption and any financial harm, says Reuters.