Christensen and De Jong were both expected to be given the green light to return against PSG after recovering from Achilles and ankle issues respectively.
However, Pedri was seen as a major doubt, with the Spain international out of action since the start of March due to another thigh problem.
Initially, there had been fears that Pedri would require an operation, which would end his season and also rule him out of this summer's European Championship.
It later became apparent that the midfielder's issue was not as serious as first feared, and he was named in the Barcelona squad for the contest with PSG in Paris.
De Jong, Pedri in line to make returns against PSGThere had been claims that his inclusion in the squad did not necessarily mean that he would be available to take on the French champions.
However, speaking during his press conference, Xavi has confirmed that the midfielder is available, with the 21-year-old handing Barcelona a major injury boost at a vital stage of the campaign.
«I can confirm that all those who have travelled will be available tomorrow, barring any surprises,» Xavi said during his press conference when questioned on the squad list.
«I won't give any clues, but it will be important. They (Pedri, De Jong) will give us individual duels, Luis Enrique's teams are perhaps the most intense in the world. The demand is maximum, we will have to come out of this pressure very well. I think we have worked well.»
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