"If you look at the industrial logic of the deal it's very compelling," Bracken told the Morgan Stanley European TMT Conference in Barcelona, adding that he saw "a lot of reasons to monetise" the synergies it promised.

Bracken also said that Liberty would look opportunistically at listing its local units to crystallise the value of their cash flows. This would be interesting in the Swiss context due to the country's negative interest rates, he added.

Asked about whether Liberty would consider a combination between UPC and Salt, another Swiss operator, Bracken said potential operating synergies would be lower than with Sunrise but that a deal could be doable.

"The exam question is relative value," said Bracken. "There's lots of ways you can combine companies without having to put cash in."

(Reporting by Douglas Busvine; editing by Paul Sandle and Jason Neely)