The Benfica midfielder, who spent the 2011/12 campaign on loan at Granada, is being plagued by muscular problems, and has been forced to leave the squad after failing to reach full fitness.

Bento has opted to call up Hugo Viana as replacement for the 30-year-old Martins.

The Braga midfielder missed out on Portugal's initial 23-man squad, but will now be heading to Poland and Ukraine.

The 29-year-old's last call up to a major international tournament was the 2006 World Cup.

Portugal have been drawn in Group B along with Germany, Netherlands and Denmark.

Before Bento's side travel to their Euro training camp in the Polish town of Opalenica, they will play two friendly matches on home soil against Macedonia and Turkey.