He remains hopeful of making two or three additions before the window closes at the end of the month, although he has had to downgrade his ambitions markedly since the turn of the year.
Former Newcastle United owner Sir John Hall fears for his old club with Mike Ashley in control.
With 11 days gone, Benitez's confidence is ebbing away.
'We are not thinking of selling players that are playing already.
Benitez, keen to add Premier League experience to his squad, has been looking at the loan market.
Newcastle failed to sign the likes of Tammy Abraham and Andre Gray in the summer transfer window, but at least the pair did move on to fellow Premier League clubs.
A number of fringe players could leave the club this month.
Swansea will arrive with manager Carlos Carvalhal unbeaten as a manager at St James' Park, sealing 1-0 wins there with Sheffield Wednesday in both 2015 and 2016. United could instead subsidise a loan.
Relegation rivals West Ham have an interest in Jonjo Shelvey, but the Magpies boss has ruled out letting any player go who has a part to play on the pitch.
"As soon as I found out Newcastle were interested, there was only one place to go, but obviously I don't want to see them go down, because I want to play against them and I have mates in their team", said Shelvey, signed in January 2016 for £12million. If he can improve a lot during these months - and I am sure he will continue improving - then you never know.
Benitez will face the media today ahead of the Swansea game.
It's been another troubled week off the pitch for Newcastle with Under-23 coach Peter Beardsley the subject of an internal investigation over alleged bullying and racism.