The Spaniard is struggling with a hamstring injury and will sit out the Reds' Europa League encounter against Anzhi Makhachkala on Thursday.
"We are not quite sure at the moment," said Pascoe. "Hopefully not too long. He is doing his rehab at the moment and is working hard in training.
"So we will just have to assess him over the weekend and we will see then."
Liverpool are currently 12th in the Premier League table with nine points from eight matches.