The Dutchman has yet to get fully firing this campaign.
The Dutchman is slowly returning to full fitness after an injury-ravaged first year on Tyneside, but has been unable to bring about an end to the club’s dismal run.
Early season performances showed some promised, but the manner of the last three defeats, in particular, have been worrying.
“It’s difficult to say (why we are on such a bad run),” said de Jong.
“We are trying to work hard but it’s that extra bit of confidence you have when you are winning games... Everybody wants to fight but we are losing the ball too easily.”
A lack of fluency in their attacking play has been on full display for Newcastle this season, with Steve McClaren’s men guilty of gifting possession away far too frequently.
They haven’t been clinical enough when chances are created either, and de Jong held up his hands for his own poor form in front of goal.
“I had two chances at the end (against Sheff Wed), when you are 100% one of those has to go in,” said the 26-year old in the Chronicle.
“It’s difficult to explain…For me I am trying to get back to fitness, by the end I had cramp in both hamstrings and I need more minutes and games.
“I was frustrated about the two chances at the end… Things just aren’t falling in the right place.”
De Jong’s words paint a worrying picture of the mood at the club, with no one seemingly able to put their finger on why the performances have been so abject.
Time is running out for McClaren to turn things around and he will need the likes of de Jong to start producing sooner rather than later if he wants to remain in the hot-seat.