Newcastle finished an impressive 10th on their return to the Premier League last season despite what Benitez saw as a lack of investment in the playing staff.
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Benitez is a practised politician but he sounds at the end of his tether, with his latest complaints running much deeper than merely being a case of a manager putting pressure on his board before the closure of a transfer window.
Benitez claimed he wanted three or four more players.
Less than 24 hours after manager Rafa Benitez had said "things are not going well off the pitch and you can see a reflection of that on the pitch" in the wake of a 4-0 friendly defeat to Braga, the Magpies have acted by bringing in Muto.
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The Toon's frugality in the transfer market has been a source of frustration for their loyal fans for many years, with owner Mike Ashley repeatedly unwilling to fork out sums for players.
Talks broke down between the two clubs earlier this week.
"You're a very courageous man if you go out and criticise the owners, which to be fair is what he's doing", The former England boss told talkSPORT.
"You have to be very self-confident in that you are criticising Mike Ashley with what you are saying".
"But Rafa's fearless enough and experienced enough to do it".