A world-class field featuring several Olympic medallists at the Singapore leg of the Fina/airweave Swimming World Cup will also include 29 swimmers from the Republic.
However, the trio of Quah siblings will not be among those flying Singapore's flag at the OCBC Aquatic Centre when the two-day event begins on Friday.
Quah Ting Wen, 24, and younger brother Zheng Wen, 20, have not been pencilled in as they took an extended break from training after the Rio Games in August and got back into the pool only recently.
"The Rio Olympics was an incredible opportunity and experience for us," the duo, responding to queries from The Straits Times, said in a joint statement yesterday.
"We spent months away from home training prior (to the Games), and hence decided to take a break and recover post-Olympics.
"We've only just returned to the pool to train with the National Training Centre squad and we feel it's a little too early for us to be participating.
"(But) we're still going to be involved, and look forward to seeing the best swimmers in the world compete in Singapore."
Zheng Wen reached two semi-finals in three events at the Olympics. He was recently granted an extended deferment from national service until after the 2020 Tokyo Games, which would allow him to focus on training.
He had performed well in last year's World Cup series, bagging seven medals.
Youngest sister Jing Wen, 16, is focusing on preparing for her O-Level examinations.
Said assistant national head coach Gary Tan: "Both (Ting Wen and Zheng Wen) embarked on a month-long break to recuperate, reflect on their Olympic journey and spend time with their family... They are currently in a phase where they need to get back into a good physical condition before embarking on any other competitions."
The Singapore side will be a mix of seasoned competitors and younger campaigners, among them SEA Games freestyle sprint queen Amanda Lim.
Some of the biggest names at the Singapore leg include Olympic champions such as Hungary's Katinka Hosszu, who arrived on Saturday night. South Africa's Chad le Clos and Australia's Kyle Chalmers are also competing.