A contractual dispute between Frederic Makowiecki and Aston Martin Racing will prevent the Frenchman from making his first appearance as a factory Porsche driver in this weekend's Daytona 24 Hours.
AMR is known to have taken up its option on Makowiecki to continue with the Prodrive-run squad for a second season in the World Endurance Championship.
Makowiecki is also known to have indicated to AMR that he no longer wanted to drive for the team and is believed to have alleged breach of contract that made the deal void.
It is understood that he was not in contact with Porsche at that stage.
The 33-year-old, who was unable to comment on any dispute with Aston, told AUTOSPORT on the announcement of his Porsche deal in December that he had "failed to find a reference" with the team over the course of last season.
The reason given by AMR for Makowiecki's absence from its line-up in three of the eight WEC rounds last year was his testing commitments with Honda in Super GT, but it is known that he had no duties scheduled on at least one of those dates.
AMR team principal John Gaw would not comment on the situation.
Makowiecki, who will be part of Porsche's WEC campaign with the Manthey team in 2014, had been placed with the NGT Motorsport GT Daytona class squad for this weekend's United SportsCar Championship opener.
His place has been taken by 2013 Porsche Supercup champion Nicki Thiim, who also raced for AMR in the WEC last season.