March 18 (Reuters) - The Swiss National Bank and Swiss regulator Finma have told their international counterparts that they regard a merger deal with UBS as the only option to arrest a collapse in confidence in Credit Suisse, the Financial Times reported on Saturday.

UBS Group AG , Credit Suisse Group and key regulators are rushing to finalise a deal on the merger of the two Swiss banks as soon as Saturday evening, the FT reported, citing people familiar with the matter. (Reporting by Jyoti Narayan in Bengaluru Editing by Frances Kerry)