Katherine Grainger has been assured she will be selected for a fifth Olympic Games despite missing out on being named in the initial list of rowers announced on Thursday.
The British Olympic Association on Thursday announced the names of 43 of the 47 rowers to compete for Team GB in Rio in August. Grainger's name was absent.
The 40-year-old, who at London 2012 claimed a first Olympic gold at the fourth attempt after silvers in three prior Games, was seeking selection in the women's double scull with Vicky Thornley, but the names to compete in the boat are still to be confirmed.
British Rowing performance director Sir David Tanner explained that Grainger and Thornley had wished to be considered for selection in the women's eight and underwent tests on Monday.
The pair were unsuccessful in breaking into the larger boat, but Tanner says their selection in the double scull is a formality.
He said: "We did some testing at the beginning of this week to see whether or not the double of Katherine Grainger and Vicky Thornley could, at their request, make a slot for themselves in the women's eight.
"That was not to be. It was a very tough test, they just narrowly missed out.
"We are without question going to nominate it to Team GB and that is the women's double.
"It's my confident intention very soon to be announcing those two back in their double and racing for Team GB at the Rio Games.
"There are one or two steps before we get there, but very, very soon."
Tanner said it was not possible to nominate Grainger and Thornley prior to the BOA-imposed deadline of Tuesday night. The names of two spares are also to be announced.
He dismissed the suggestion there was doubt over the selection.
"There is no uncertainty," he said.
"The only issue is that we weren't ready to get the announcement in in time for today. It's quite straightforward.
"We did it for performance reasons, not to necessarily align with this announcement."
The women's eight are European champions and are coxed by Zoe de Toledo. The crew features Frances Houghton, who is set for her fifth Olympics and Polly Swann.
Swann won the women's pair world title in 2013 alongside Helen Glover, who is reunited in the boat with Heather Stanning.
Glover and Stanning won Britain's first gold medal of London 2012 four years' ago and will aim to defend their title in Rio.
Alex Gregory, who won London 2012 gold in the men's four, is joined in the same boat by Mohamed Sbihi, George Nash and Constantine Louloudis. All three won bronze in the eight at London 2012.
A further group of 12 sweep (single oar) rowers have been named to form the men's eight, pair and two reserves.
Pete Reed and Andrew Triggs Hodge, who won gold medals at Beijing 2008 and London 2012, have been named in the group.
Katherine Copeland, who won the women's double scull four years ago, will seek to defend her title with Charlotte Taylor.
Richard Chambers and Will Fletcher compete in the equivalent lightweight men's boat.
The lightweight four comprises Peter Chambers, Richard's younger brother, Chris Bartley, Jono Clegg and Mark Aldred.
London 2012 bronze medallist Alan Campbell will race in the single scull at his fourth Games, while Jonathan Walton and John Collins will contest the men's double scull.
Peter Lambert, Sam Townsend, Angus Groom and Graeme Thomas are set for the quadruple sculls.
Despite the stories emanating from Rio, with Zika virus a concern for rowers competing on the lagoa, Tanner expects a wonderful Games.
"The first Olympics in South America will be outstanding," he said.