Liverpool will play a stronger squad against Porto this evening.
The Reds injury scares are well-documented this season but some of the senior players have returned to the first-team squad.
Liverpool have already qualified for the next stage of the competition with two games to spare and will be facing Porto at Anfield on Wednesday night.
Klopp said: “We always respect the competition but we have to think about ourselves, our schedule and the situation of our players first.
“Hendo, we’ll see, yesterday (Monday) I would say he was not 100 per cent, so he could play and do pretty much everything, but it’s about really being 100 per cent fit.
“So I thought, when he came on against Arsenal, it was just to see it out it and control it a little bit and that was exactly what he had to do from a rehab point of view, so he used these few minutes. But now we have to see, I don’t know exactly 100 per cent.
“Robbo is similar. They are both OK, but are both now ready to play and ready to start with the schedule and the [amount of] games coming up? Well, I have to make the decision to be honest and we haven’t made it yet, we will have to see.
“It is how we all know at this period of the season, the medical department has a big hand in the line-ups. We will see that.”