London 2012 organisers will stick with architect Zaha Hadid, but she has been instructed to bring costs back into line with the original £75million estimate.
London's bid to the IOC pledged that the centre - a 20,000-seat arena with two 50-metre pools and a diving pool - would cost £75million
"I cannot give anyone a complete assurance that costs for the 2012 Games will not rise," said Olympic minister Tessa Jowell.
"But what I will do is be absolutely ruthless in ensuring that any potential overspend, no matter how small, is caught early and driven back down wherever possible."
