Bento said on Friday the two defenders will be assessed by Portugal's medical team on Monday.
Portugal host the first leg at Lisbon's Luz stadium on November 15 (1945 GMT) and travel to Stockholm four days later.
Squad:
Goalkeepers: Beto (Sevilla), Rui Patricio (Sporting), Eduardo (Braga).
Defenders: Joao Pereira (Valencia), Ricardo Costa (Valencia), Andre Almeida (Benfica), Antunes (Malaga), Fabio Coentrao (Real Madrid), Pepe (Real Madrid), Bruno Alves (Fenerbahce), Luis Neto (Zenit St Petersburg).
Midfielders: Miguel Veloso (Dynamo Kiev), William Carvalho (Sporting), Raul Meireles (Fenerbahce), Joao Moutinho (Monaco), Ruben Micael (Braga), Josue (Porto).
Forwards: Nani (Manchester United), Cristiano Ronaldo (Real Madrid), Helder Postiga (Valencia), Hugo Almeida (Besiktas), Eder (Braga), Varela (FC Porto), Bruma (Galatasaray).
(Reporting by Daniel Alvarenga, editing by Justin Palmer)
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