Portugal defender Pepe has thigh problem, won't train Monday

Portugal's Pepe, foreground, holds back Poland's Robert Lewandowski during the Euro 2016 quarterfinal soccer match between Poland and Portugal, at the Velodrome stadium in Marseille, France, Thursday, June 30, 2016. (AP Photo/Frank Augstein) (The Associated Press)

Portugal coach Fernando Santos, left, congratulates Pepe, at the end of the Euro 2016 quarterfinal soccer match between Poland and Portugal, at the Velodrome stadium in Marseille, France, Thursday, June 30, 2016. Portugal won 5-3 in a penalty shootout. (AP Photo/Frank Augstein) (The Associated Press)

Portugal defender Pepe is an injury concern for the European Championship semifinal against Wales on Wednesday.

Portugal press officer Onofre Costa told a news conference Pepe has a thigh muscle problem and would not be training on Monday.

The Real Madrid defender is a key player for Portugal after Cristiano Ronaldo, and has been one of the team's best players at Euro 2016.