Newcastle begin their league campaign by hosting Tottenham at St James' Park on August 11. "When things are not going well off the pitch you can see a reflection on the pitch", said Benitez following Wednesday's 4-0 friendly defeat at Braga in northern Portugal.
The Sports Direct boss has shown himself to be unwilling to fund Newcastle properly to put the club in a position to push up the Premier League table, and this latest disagreement with Benitez is simply the latest in a long line of financial disagreements with managers.
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Benitez claimed he wanted three or four more players.
He made just one league appearance for PSG last season, but looks likely to be more involved this term as Tuchel places his faith in youth.
Benitez then said of Newcastle's fans: "They have to be concerned".
He is now entering the final year of his contract on Tyneside and is refusing to sign the new deal Ashley has offered him until assurances over transfer budget and improvements to the under-23 set up, academy and training ground are met.
Muto, 26, is Newcastle's fourth permanent signing of the close season following goalkeeper Martin Dubravka, midfielder Ki Sung-yueng and defender Fabian Schar.
Rondon's £16m release clause has now expired, so a potential player-plus-cash deal is on the cards between the two clubs. "But I can't say too much".