UBS Group CEO Sergio Ermotti said the firm is gearing up for a tricky few months as it integrates the deal to acquire Credit Suisse Group.

UBS Chief Executive Sergio Ermotti hinted on Friday his bank's takeover of Credit Suisse will close on Monday, the earliest expected date. "From Monday we will be new colleagues," Ermotti told the Swiss Economic Forum in Interlaken.

"We won't be able to create, short term, job opportunities for everybody. Synergies is part of the story," Ermotti said at an event organised by the Asset Management Association Switzerland in Bern. "We need to take a serious look at the cost base of the standalone and combined organisations and create a sustainable outcome,

UBS and the Swiss government agreed on Friday how they will share losses linked to the bank's emergency takeover of Credit Suisse, clearing the way for the deal to close within days, and creating a giant Swiss bank and cementing its position as a global wealth manager.

UBS is set to finalise the takeover of Credit Suisse on Monday, but the hardest part is yet to come: turning the arranged marriage of Switzerland's biggest banks into a success.

The Swiss government made good on its pledge to indemnify banking giant UBS for losses from its $3.2 billion takeover of rival Credit Suisse on Friday, three days before the deal becomes final.