The midfielder missed the first-leg amid claims he refused to play due to injury - claims that have since been denied.
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Enrique said on Tuesday: "Ruiz? We have to see what the doctors say.
"Journalists don't know anything and I'm not a doctor either. We must respect the health of each person. The good news is that Fabian is training.
"For (Bradley) Barcola, we will have to see today's training. Every time a player is back, it's good news. He was in recovery for three weeks. We'll see how he feels today.
"All that remains is Fabian and Quentin (Ndjantou) absent."
PSG visit Liverpool tonight defending a 2-0 aggregate lead for their quarterfinal second-leg.