Jimmy Floyd Hasselbaink revealed that he played James Perch on the right wing in order to give Nedum Onuoha more protection against Newcastle.
The plan backfired as Rangers were overrun all over the pitch as the Magpies inflicted the heaviest league defeat in QPR's 96-year history in the Football League.
Jonjo Shelvey scored twice, with the second being a goal of the season contender, while Ayoze Perez, Ciaran Clark, Aleksandar Mitrovic and Grant Hanley also put their names on the scoresheet.
It went from bad to worse as Perch was forced off in the first half with a serious looking knee injury and was replaced by Pawel Wszolek as Newcastle ran riot and Hasselbaink saw this as a key moment.
He said: “At the moment we have new players in Pawel and a few others that have come in and trained a couple of times with us.
“We wanted a bit more experience in that midfield and Perch can play there. He can play right back, centre half, defensive midfield and right midfield.
“We wanted more protection for our full back with the quality Newcastle has with (Matt) Ritchie and (Yoan) Gouffran. You need that extra help.
“I thought until Perch went off that we were fine. It was a big factor that Perchy had to go off. I think it's a bad one as he's one that does not come off with little knocks.”
Conor Washington also came in for the injured Sebastian Polter and Hasselbaink is unsure when the German will be back from a glute injury.
“Seb should not be long term. He should be back soon. I don't know if Saturday is soon enough but he'll be back in the near future,” Hasselbaink explained.
“Conor didn't have a chance. We were too far apart and could not break them down. It was hard and then when they won the ball they had an easy pass forward.
“When the opposition can play the first pass forward. The first couple of goals was on the transition, which we normally do very well.
“The players have given me everything. We've lost together and we're going to pick ourselves up and be right again for Saturday.”