Sergio Pérez remains the front-runner to stay with Red Bull in 2025, sources have told ESPN.
Pérez, whose contract expires at the end of 2024, endured a tough weekend at the Monaco Grand Prix, qualifying 18th before being involved in a collision on the first lap.
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Red Bull has been in no rush to make a decision about his future, with Carlos Sainz still yet to decide what he does next year when Lewis Hamilton replaces him at Ferrari.
Sainz is understood to be monitoring the situation at Red Bull before committing to either Williams or Sauber (which will become Audi in 2026), with the long-term future of Max Verstappen also uncertain beyond 2025.
Verstappen, who has doubts about Red Bull's 2026 engine project, has been linked with a move to Mercedes for that season, which is the start of a new set of regulations.
However, it looks unlikely Red Bull opt for Sainz at this stage. Multiple sources have told ESPN that Red Bull still favour Pérez and that only a drastic drop in form over the next few races could change that situation, which lines up with team boss Christian Horner's comments to the media after the Monaco Grand Prix.
"This weekend's been pretty brutal for him," Horner said on Sunday. "Obviously we need to make sure that we have got both cars up there scoring points, because we cannot dismiss the threat of Ferrari and McLaren in both championships.
"Checo's first six races, he was very strong, qualifying on the front row and finishing second and third and scoring very well. We just need to get back into that position of confidence and not to see a dip."
Asked if Pérez's last few results have delayed a decision, Horner said: "Not really. I think that it's more our timing. We'll make a decision in the fullness of time."
Until Red Bull decides what to do with Pérez, it is likely Williams and Audi will be waiting on Sainz.
Audi is overseeing negotiations at Sauber, having brought forward its investment in the team earlier this year.
Audi has already signed Nico Hülkenberg to its project and is understood to be considering back-up options in case Sainz goes elsewhere, although the company's might find it difficult to find another marquee signing with race-winning pedigree.
Williams have been in talks with Sainz ever since Ferrari decided to replace him with Lewis Hamilton next year and over the Monaco Grand Prix it emerged they are increasingly confident of securing his services from 2025 onwards.