Portsmouth must return to the High Court on Tuesday after Her Majesty's Revenue and Customs challenged their voluntary administration.
Andrew Andronikou, the administrator in charge of the stricken Barclays Premier League club, was informed of the latest development on Monday.
Despite uncertainty over the nature of HMRC's objection, Andronikou is confident Portsmouth will continue down the route of administration as planned.
"We're having to go to court to show that the debenture is valid," he said.
"I don't understand the exact reason why this is, we're just following normal protocol. We're not unduly worried.
"It's not standard procedure but I'd imagine that HMRC are basically crossing their Is and dotting their Ts.
"We're expecting the administration to proceed as it was."
HMRC released a brief statement confirming Portsmouth must return to the High Court.
The statement read: "This matter is before the courts on Tuesday. HMRC will be making no further comment at this stage."
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