Cool water temperatures and strong tides are expected to favour New Zealand swimmers in the final Olympic qualifier for the 10km open water swim in Portugal at the weekend.
The four-strong New Zealand contingent are fighting to fill a spot among the remaining nine places open in the men's and women's competition for London.
Swimming New Zealand open water manager Philip Rush took the quartet of Cara Baker, Charlotte Webby, Jonathan Pullon and Kane Radford to Europe three days ago.
"We wanted to ensure they were able to settle after the travel and be well prepared. The hotel has filled up now and there's a real buzz of expectation," Rush said.
The current water temperature in Setubal Bay, just south of Lisbon, is 16 degrees Celcius.