Cristiano Ronaldo and Ricardo Quaresma share a joke while Pepe trains alone as he fights to be fit for Portugal's Euro 2016 semi-final with Wales

Cristiano Ronaldo was in a playful mood on the eve of Portugal's Euro 2016 semi-final clash with Wales - while Pepe trained alone as he continues his battle to be fit to face Chris Coleman's side.

The Portuguese squad once again trained at their Marcoussis base ahead of the last four game in Lyon, with leading-man Ronaldo sharing a joke with Ricardo Quaresma before tugging on the ear of his old friend.

Ronaldo has yet to find his best form in France, despite scoring twice, while Quaresma has arguably been the tournament's most impactful substitute thanks to his last-gasp goal against Croatia and the winning penalty against Poland. The two have known each other since their teens, having come through the Sporting Lisbon youth system together.

But while the attacking duo shared a joke and trained with the rest of the squad, Pepe worked alone with the Portuguese fitness team as he continues his recovery from a thigh problem.

The Real Madrid defender remains an injury doubt and missed training on Monday because of the issue. Portugal's staff continue to monitor his condition.

Should he not be passed fit for Wednesday's fixture at the Stade de Lyon, 38-year-old former Chelsea defender Ricardo Carvalho is expected to replace him.

Pepe, 33, remains a key figure in coach Fernando Santos' team and plays alongside Wales' Gareth Bale at club level.

His potential absence comes at a time when Wales will be without the suspended Aaron Ramsey and Ben Davies.

Cristiano Ronaldo and Ricardo Quaresma share a joke while Pepe trains alone as he fights to be fit for Portugal's Euro 2016 semi-final with Wales

Cristiano Ronaldo was in a playful mood on the eve of Portugal's Euro 2016 semi-final clash with Wales - while Pepe trained alone as he continues his battle to be fit to face Chris Coleman's side.

The Portuguese squad once again trained at their Marcoussis base ahead of the last four game in Lyon, with leading-man Ronaldo sharing a joke with Ricardo Quaresma before tugging on the ear of his old friend.

Ronaldo has yet to find his best form in France, despite scoring twice, while Quaresma has arguably been the tournament's most impactful substitute thanks to his last-gasp goal against Croatia and the winning penalty against Poland. The two have known each other since their teens, having come through the Sporting Lisbon youth system together.

But while the attacking duo shared a joke and trained with the rest of the squad, Pepe worked alone with the Portuguese fitness team as he continues his recovery from a thigh problem.

The Real Madrid defender remains an injury doubt and missed training on Monday because of the issue. Portugal's staff continue to monitor his condition.

Should he not be passed fit for Wednesday's fixture at the Stade de Lyon, 38-year-old former Chelsea defender Ricardo Carvalho is expected to replace him.

Pepe, 33, remains a key figure in coach Fernando Santos' team and plays alongside Wales' Gareth Bale at club level.

His potential absence comes at a time when Wales will be without the suspended Aaron Ramsey and Ben Davies.