However, four people briefed on HSBC's plans said Mr Quinn would not be confirmed on or before February 18 and that the search for a permanent successor was still in progress.
Two of the people said a meeting of HSBC's board in Dubai last month, when some directors had expected a decision to be made, broke up without a conclusion on the matter.
"Sometimes these things take a little more time than people would like, but this is an orderly process," said one person briefed on the board's search for a chief executive, adding that the directors needed to arrive at a unanimous decision.
One top 20 investor said: "It would be very, very odd to have what is being trailed as a large restructuring effort, potentially the most radical we've seen from the bank, that is not implemented by the guy who designed it.
"They have had six months, which is long enough to assess internal and external candidates, so if they're not announcing someone, it is quite obvious there is an internal debate as to whether Noel is the right person."
The investor added that Mr Quinn would be "rightly pissed off" if he has to present the plan without being sure that he will be in charge of delivering it.
A second top 20 shareholder said it would be "a big problem if Noel puts the plan in place and then has to go".
Ronit Ghose, a banks analyst at Citi, said: "The stock market is expecting the new strategy . . . to be presented by a permanent CEO. Anything else is like saying we are going into battle, it will be messy, and we don't know the general in charge."
The issue of succession is particularly thorny for HSBC given that the bank has messed up the process in the past. Mr Tucker has told colleagues that he bitterly regrets appointing Mr Flint, while the replacement of the chief executive and chairman in 2010 was marred by acrimony and boardroom splits.
One of the people briefed on the search said "the most important thing is that this is a thorough process and that we come to a correct decision", adding that Mr Quinn was the only internal candidate and "not out of the race".
HSBC declined to comment.
Although Mr Quinn holds his position on an interim basis, he has said he is not a "caretaker". Investors have become increasingly convinced that the job is his to lose after he pressed ahead with the strategic overhaul and made a string of high-profile management changes, including moving the longstanding head of HSBC's investment bank.
On Wednesday, Mr Quinn announced further changes to the executive team. He appointed Stephen Moss as regional chief executive for Europe, the Middle East, Latin America and Canada, while Nuno Matos will become chief executive of Europe. Mr Matos's predecessor, James Emmett — a 25-year veteran of the bank — is stepping down from his role at the end of the month and will fully retire in September.
Written by: David Crow
© Financial Times 2019