Speaking to the Financial Times, Leibbrandt says that the emergence of sophisticated cyber hackers has "changed the game completely".

"We could say that if the immediate security around Swift is not in order we could cut you off, you shouldn't be on the network," he told the paper. "There are pros and cons to that. The pros are that it provides clarity that if you are on the Swift network you need minimum standards. I think the con is if you do it too heavy handed you could drive people to unsafe channels."

His comments come just days after the interbank co-operative detailed new security measures in the wake of a string of high-profile attacks at multiple bank sites.

The list of remedies - including tougher security and operational baselines, and related audit standards and certification processes for the secure management of Swift messages at customer sites - stopped short of the threat of suspension for banks that fail to measure up; the expectation being that the benchmarks would be policed by counterparty banks and international regulators.

Liebbrandt's remarks to the FT signal that Swift is preparing to take a hard line with recalcitrant member banks, as the realisation dawns that only the toughest sanctions will restore faith in the integrity of the payment instructions passed over the network.

Speaking to Reuters as part of a PR-led offensive to stop the story spinning further out of control, Liebbrandt said that the cost of its new security initiatives may force the company to review its strategy, scaling back on plans to expand into new markets as it regroups

“We need to take a look at what we are doing. We cannot carry on with everything we did before and do this on top, that wouldn’t be credible,” the CEO told the wire.

He said Swift would pull back from “a few areas” but declined to name any candidates.

“There are no holds barred in solving this problem, so as far as I am concerned, nothing is off the table.”.