"We are not under special time pressure," he said in an interview when asked how quickly the bank needed to decide.

Asked whether the bank could skip the IPO, he said: "The board will review with management this and all other options and decide which is the best long-term solution for the company and shareholders."

Citing sources familiar with the matter, Reuters has reported that Switzerland's second-biggest bank is also considering a stock sale at group level and was likely to make a decision in April on how to proceed.

(Reporting by Michael Shields and Oliver Hirt, editing by John Miller)