The Real Madrid defender has surprisingly walked out on his national team's preparations for their Euro 2012 qualifier, with reports of a bust-up at the end of Wednesday's training
The 33-year-old was selected by coach Paulo Bento to form part of his 23-man squad, but has decided to abandon the squad of his own accord, with his participation in their match on September 2 now in doubt.
"The player left the training camp on Wednesday, by his own initiative and without communicating that absence to the FPF or to the national coach," read a statement released by the Portuguese Football Federation.
However, Portuguese sports daily Record has since reported that an incident had boiled over during a training session on Wednesday involving the Madrid centre-back, who was bizarrely spotted leaving the camp in team-mate Fabio Coentrao's car.
As a result, Carvalho will not fly out with the rest of the squad to Cyprus, and possibly not add to his haul of 71 international caps.