Speaking after their 6-0 Champions League win against Qarabag, Slot admits a fresh setback for Jeremie Frimpong may force them to seek a short-term loan signing.
He said: "We as a club always make decisions that we, at least, think (are) smart decisions. So, we not only look at the short term, we also look at the long term, longer term – that's why we sign young players as well, very good players but young ones that can still develop. Now we can see this development with a few.
"And it always depends on are there players available that we think can help us? And if they are, can we afford them? And does this also be helpful for the longer-term future because our players come back from injury as well?
"I just said we don't have a squad where we have four right-backs and 12 midfielders and three or four No.9s – that's not how it works over here. So, we have to do the smart things for the near future but also for the longer future. Let's first see how Jeremie (Frimpong) is.
"Maybe he's not able to play Saturday but maybe he's able to play one or two days later. We now go into a schedule with one game a week, so that would usually mean less injuries but you're never sure."