By Obaloluwa Joshua, LAGOS

Portugal goalkeeper Diogo Costa remains a doubt for the side’s upcoming international friendly against the Super Eagles of Nigeria, reports PNO Sports.

The FC Porto goalie is yet to train with his teammates since they open camp for the friendly in Lisbon on Monday.

Costa, according to reports missed training on Monday and Tuesday due to muscular problems.

The 21-year-old has made seven appearances for his country.

Roma’s Rui Patricio and Jose Sa, who plays for Premier League club, Wolverhampton Wanderers are the two other goalkeepers in the team.

The friendly is billed for Thursday at the Estadio Jose Alvalade, Lisbon.