Portugal have been dealt a blow ahead of the World Cup with forward Diogo Jota ruled out of the tournament in Qatar due to a calf injury, Liverpool manager Juergen Klopp said on Tuesday.

Four years ago, Cristiano Ronaldo produced an emphatic performance as the forward bagged his maiden World Cup hattrick to help Portugal draw 3-3 against Spain in their Group B encounter of the FIFA World Cup 2018 in Sochi. 

Cristiano Ronaldo, Joao Moutinho and Raphael Guerreiro will all miss Portugal's Nations League match against Switzerland this weekend, coach Fernando Santos announced on Saturday.

Portugal scored twice in five minutes to beat the Czech Republic on Thursday and open up a two-point lead at the top of Group A2 in the Nations League.

Cristiano Ronaldo scored twice as Portugal swept to an emphatic 4-0 victory over Switzerland in their UEFA Nations League clash at the Estadio Jose Alvalade in Lisbon on Sunday.