Sauber team principal Fred Vasseur said in Brazil last week that he expected to announce the team's driver lineup for 2018 by this weekend, but he's since delayed the announcement.
Vasseur said he won't make the announcement until next week at the earliest as he is unsure about what direction to go for next year.
It's expected that either Antonio Giovinazzi or Marcus Ericsson would fill the second seat alongside Charles Leclerc, but Vasseur said he was "too optimistic" about the decision coming this weekend before the Abu Dhabi Grand Prix.
"It is just a question of days," Vasseur said via Motorsport. "I don't think it will happen over the weekend, but probably much more likely next week."
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Vasseur also said the decision wasn't necessarily of the utmost importance for him to make at this time.
"It is not difficult but it is not the first priority for the team," he said. "I can understand that it is a key point for you, and probably more for the drivers.
"But it is not a key point for the team and alongside driver choice, we have other topics to discuss. There is a driver position in FP1 and so on. So it will probably take a bit longer than expected."
Either way, it does sound like the decision will come relatively soon, though probably not soon enough for the drivers waiting on the announcement.