By Stefania Spezzati, Oliver Hirt and John O'Donnell

(Reuters) - UBS is close to finalizing a deal to buy rival Swiss bank Credit Suisse, a source familiar with the matter told Reuters.

The deal is valued at more than $2 billion, after UBS increased its offer, the Financial Times earlier reported. The Credit Suisse chair declined to comment when reached on his cell phone.

The Swiss National Bank has agreed to offer a $100 billion liquidity line to Credit Suisse, the FT said.

A news conference is expected later on Sunday.