Liverpool trained earlier on Tuesday on Merseyside and the Dutchman was a surprise absence from the session.
Liverpool have a huge challenge ahead of them in the French capital on Wednesday night, as they look to tame one of the few sides in European football who look capable of matching them.
The Reds will of course be more challenging opposition, although they will still have to be at their very best to be level or ahead in the tie before the second leg at Anfield next week.
Ian Doyle will be in Paris to speak to the Reds boss, while Theo Squires is back on Merseyside to provide build-up, live updates and reaction to the press conference.
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