Robertson has been struggling with an ankle injury, which is why he missed out on the Scotland squad during the international break.
He was fit enough to play during the Reds' 2-1 win over Crystal Palace at the weekend. But he admitted that he is not fully fit.
"It is still painful but, you know, it is something that I gave time for it to improve," said the left-back to reporters.
"Keeping it moving will help it. Hopefully in time it will be better.
"I was desperate to play and the gaffer asked me if I was okay, I believed I was and luckily I got through the game.
"Me and Mo (Salah) were in the same position. Mo was desperate to play as well and the manager made the decision and Mo was fine and accepted it.
"You don't want to miss any games but if it means him missing one game rather than six, this is a big difference.
"Sometimes you need to be a bit clever. I have come through, Mo was not needed although he was stripped when Bobby scored and sat back down. Hopefully that will give him more time to settle and hopefully he will be fine for midweek (against Napoli in the Champions League)."
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