"I don't mind putting Jimmy and Robbie in the dugout, but the other lads have got to do the business.
"I've left out big players before as a manager - and Jimmy and Robbie have been on the bench before in their careers.
"As a manager you just make the decision you believe is right. If you're banging the goals in, how can you leave your strikers out?
"It was important to get a result here, because otherwise the temptation might have been to put the new signings in before they're ready," Jones added.
"That's the kind of thing I've never done and wouldn't want to do now. The new players have got to be fully fit and right to play.
"The lads worked hard today and everyone was on top of their game, which is what I was looking for from them.
"My lads put in a good shift and they needed to, because if they hadn't then QPR would have beaten us. They tried to beat us into submission but it didn't work."
"We were second to the ball over the pitch," he said.
"Cardiff have a wealth of experience and I have to say they were on the front foot throughout and played very well.
"Apart from a period at the start of the second half, Cardiff dominated the game and our performance was poor.
"Cardiff chased lost balls, harassed our players and worked harder than us. We looked timid and well below par.
"Their centre-backs played with a no-nonsense approach and ours didn't. I could have played against our centre-backs today.
"I can't find a smile after that. As a manager I find a display like that a major disappointment."