Ibrox side Glasgow Rangers will not want to slip further behind Celtic this season.
Celtic beat Astana 5-0 in the first leg of their qualifying match, to give themselves a seemingly unassailable advantage.
Celtic are now expected to have an increased amount of money to spend on improving their squad this summer.
However, Rangers boss Caixinha insists that he is not fazed by his Glasgow rivals being able to spend money.
Indeed, Caixinha insists that Celtic need to buy quality, otherwise their increased budget will count for nothing.
“If you have more money you can invest more money. But it’s not my concern, having more money or less money,” the Ibrox side’s boss said.
“It’s my concern to know in which direction this football club is working and that we are all working together in the same direction. That is my only concern.
“Football is about quality, football is about players. If you have more money you might get better players, that’s the way it is. But you need to spend it wisely. It’s not only about budgets in football. Budgets are important, but it’s not always about budgets.”
If Celtic do invest wisely, it will be even tougher for Rangers to close the gap on their city rivals.
Celtic have been the dominant force in Scottish football in recent years and, remarkably, still remain unbeaten in domestic competition since Brendan Rodgers took charge.
Rangers, meanwhile, have shown signs of improvement this term – but were beaten in their last match against Hibernian.
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