Ibrox side Glasgow Rangers are still interested in signing Jamie Walker and Kenny McLean.
Rangers have been targeting Walker of Hearts and McLean of Aberdeen for much of the summer so far, but have struggled to negotiate a fee with their respective sides.
However, Caixinha appears confident that a deal could be done before the end of the transfer window.
He said: “I am not worried with that. The board knows what we want, what we need, what we ask for. We still have 20 days in front of us to get what we want.
“I might say yes [it is hard to buy from Scottish clubs]. I might say they are overvalued here in Scotland, but it is the same [in other countries].”
Rangers completed most their transfer business early on in the transfer window, and the benefits of this strategy seem to be paying off now.
The Ibrox side started their competitive campaign slowly, and were knocked out of the Europa League in humiliating circumstances.
However, Rangers have improved greatly in recent times, with their new recruits seemingly starting to settle.
Rangers have won their first two domestic matches this term, as Caixinha’s side start to build momentum.
The Light Blues are next in action this weekend, when they take on Hibernian.