Rafa Benitez has admitted he was angry with his players after the 1-0 defeat to AFC Bournemouth on Saturday.
He felt decisions went against his side and was frustrated with his own players.
The Spaniard saw Dwight Gayle have a goal disallowed wrongfully for offside from referee Paul Tierney, who also did not give The Magpies some other decisions during the tie.
Newcastle were beaten with a last minute stoppage time header by Steve Cook, leading to the manager to being upset with his players at the full-time whistle, as it appeared they had stopped to listening to his instructions during the final moments.
Benitez had spoken honestly about the problems that the team faced in the dressing room at the end of the match at St. James Park, stating that he and his players were both angry towards each other.
"Yes, I was angry after the game, because you have to say what you think.
"My main priority is to make sure that the players understand what we have to do in the future.
"I wasn't very happy with some of the things I was watching, that's it. We made mistakes and in the end, we paid for that."
The Newcastle boss acknowledged that it was normal for players to be angry and upset after losing a game, however, reiterated the importance for his squad to remain calm as there is still a long way to go before the end of the season.
"We gave the ball away easy without great pressing, and we were giving them chances to counter-attack,” Benitez continued.
“Yes, the players were angry. They are not very happy obviously. That's very common when you lose a game.
"We knew it would be a long season and we would have good results and bad results. We will stay calm and try to do the right things."
MAN UTD 4 NEWCASTLE 1 (Gayle)
Elliot, Yedlin, Lejeune, Clark, Manquillo, Murphy, Hayden, Shelvey, Ritchie (Aarons 66), Gayle (Diamé 77), Joselu (Mitrovic 71)
Subs: Pérez, Mbemba, Darlow, Gámez
NEWCASTLE 0 BOURNEMOUTH 1
Elliot, Yedlin, Lascelles (Clark 55), Lejeune, Manquillo, Ritchie, Hayden, Shelvey, Atsu (Murphy 82), Gayle, Joselu (Pérez 68)
Subs: Diamé, Darlow, Gámez, Mitrovic
BURNLEY 1 NEWCASTLE 0
Elliot, Yedlin, Lascelles, Lejeune, Manquillo, Shelvey, Diamé (Gayle 83), Ritchie (Murphy 79), Pérez (Hayden 76), Atsu, Joselu
Subs: Clark, Saivet, Darlow, Gámez
NEWCASTLE 1 CRYSTAL PALACE 0 ((Merino)
Elliot, Yedlin, Lascelles, Lejeune, Manquillo, Hayden (Merino 56), Shelvey, Ritchie, Pérez (Diamé 66), Atsu, Joselu (Mitrovic 78)
Subs: Clark, Murphy, Darlow, Gámez
SOUTHAMPTON 2 NEWCASTLE 2 (Hayden, Perez)
Elliot, Yedlin, Lascelles, Lejeune, Manquillo, Ritchie, Shelvey, Hayden, Atsu (Murphy 82), Perez (Merino 63), Joselu (Gayle 69).
Subs: Darlow, Clark, Gamez, Diame.
NEWCASTLE 1 LIVERPOOL 1 (Joselu)
Elliot, Yedlin, Lascelles, Clark, Manquillo, Shelvey, Merino (Hayden 74), Ritchie, Pérez (Diamé 90+1), Atsu, Joselu (Gayle 79)
Subs: Murphy, Lejeune, Darlow, Gámez
BRIGHTON 1 NEWCASTLE 0
Elliot, Yedlin, Lascelles, Clark, Mbemba (Gámez 83'), Hayden (Shelvey 68'), Merino, Ritchie, Pérez, Atsu, Joselu (Gayle 71')
Subs: Murphy, Diamé, Manquillo, Darlow
NEWCASTLE 2 STOKE CITY 1 (Atsu, Lascelles)
Elliot, Yedlin, Lascelles, Clark, Mbemba, Hayden (Shelveyat 69'), Merino, Ritchie, Pérez (Diamé 86'), Atsu, Joselu (Gayle 78')
Subs: Murphy, Manquillo, Lejeune, Woodman
SWANSEA 0 NEWCASTLE 1 (Lascelles)
Elliot, Manquillo, Clark, Lascelles, Gamez, Hayden (Diame 69), Merino, Ritchie, Perez, Murphy (Atsu 59), Joselu (Gayle 78).
Unused subs: Shelvey, Lejeune, Yedlin, Woodman.
NEWCASTLE 3 WEST HAM 0 (Clark, Joselu, Mitrovic)
Elliot, Manquillo, Lascelles, Clark, Mbemba, Merino, Hayden (Diaméat 82'), Ritchie (Murphy 88'), Pérez, Atsu, Joselu (Mitrovic 72')
Subs: Aarons, Saivet. Gámez, Woodman
LC NEWCASTLE 2 NOTTINGHAM FOREST 3 (Mitrovic, Aarons)
Darlow; Sterry (Lazaar, 58), Hanley, Mbemba, Gamez; Saivet, Barlaser (Hayden, 70); Murphy, Diame, Aarons (Ritchie, 76); Mitrovic (Joselu, 105).
Subs not used: Woodman, Lascelles, Manquillo.
HUDDERSFIELD 1 NEWCASTLE 0
Elliot, Manquillo, Lascelles, Clark, Mbemba, Hayden (Diame 76), Merino, Atsu, Perez (Murphy 80), Ritchie, Gayle (Joselu 52).
Subs not used: Saivet, Aarons, Darlow, Mitrovic.
NEWCASTLE 0 TOTTENHAM 2
Elliot, Manquillo, Lejeune (Mbemba 34'), Clark, Dummett (Lascelles 7'), Shelvey, Hayden, Ritchie, Pérez, Atsu, Gayle (Merinoat 76')
Subs: Murphy, Aarons, Merino, Darlow, Mitrovic
PRE-SEASON
NEWCASTLE 2 HELLAS VERONA 0 (Perez, Atsu)
Elliot (Darlow 64), Manquillo (Gamez 64), Lejeune (Lascelles 64), Clark (Mbemba 64), Dummett (Merino 64), Ritchie, Shelvey (Aarons 64), Hayden, Atsu (Murphy 64), Perez (De Jong 72), Mitrovic (Diame 64)
WOLFSBERG 1 NEWCASTLE 3 (Mitrovic, Ritchie Pen, Atsu)
Elliot (Darlow, 70), Manquillo (Mbemba, 70), Lejeune (Lascelles, 70), Clark, Dummett (Gamez, 70), Ritchie (Murphy, 70), Shelvey, Hayden (Merino, 70), Atsu (Aarons, 70), Perez (de Jong, 70), Mitrovic (Diame, 46).
Subs not used: Colback, Gayle.
MAINZ 2 NEWCASTLE 1 (Gamez)
Darlow (Woodman 60), Yedlin (Manquillo 27), Clark (Mbemba 46), Lejuene (Merino 79), Dummett (Gamez 46), Colback (Shelvey 60), Diame (Perez 60), Murphy (Hayden 60), Ritchie (Aarons 46), De Jong (Atsu 60), Mitrovic (Gayle 60)
BRADFORD CITY 0 NEWCASTLE 4 (Gayle, Murphy 2, Mitrovic)
Elliot (Woodman, 61), Yedlin (Manquillo, 46), Lejeune (Mbemba, 61), Clark (Saivet, 77), Dummett (Gamez, 61), Atsu (De Jong, 61), Shelvey (Aarons, 61), Hayden (Colback, 77), Ritchie (Murphy, 46), Perez (Diame, 46), Gayle (Mitrovic, 61).
PRESTON 1 NEWCASTLE 1 (Mitrovic)
Elliot (Darlow, 46, Woodman, 70), Mbemba, Hanley (Yedlin, 46), Lejeune (Manquillo, 77), Dummett (Clark, 46), Atsu (Murphy, 46), Diame (Colback, 46), Shelvey (Hayden, 46), Aarons (Perez, 46), de Jong (Roberts, 62), Mitrovic (Gayle, 46).
HEARTS 1 NEWCASTLE 2 (Gayle 2)
Elliot (Woodman 63), Aarons(Gamez 46), Clark (Dummett 46), Mbemba (Hanley 62), Lascelles (Lejeune 46), Haidara (Colback 62), Shelvey (Saivet 46), Diame (Armstrong 62), De Jong (Lazaar 75), Atsu (Perez 46), Gayle (Mitrovic 46)