The Liverpool striker was dropped for the semi-final victory over Germany as Barcelona forward Pedro earned a place in attack alongside David Villa.
Torres paid the price for failing to score in Spain's earlier matches at this summer's World Cup amid concerns he has not overcome a knee operation from earlier in the year.
Del Bosque has previously said that he has no concerns over the 26-year-old's fitness, but is still not certain whether he will feature in the first XI against Holland on Sunday.
"I don't know if he will be in the line-up," Del Bosque is quoted as saying in the Daily Express.
"It was a difficult choice. Torres has been helping us all along. His work is important even if it is not noticed. He is good at occupying the centre-backs.
"I didn't talk to him before I announced the line-up (against Germany). But he is a very important part of the team. He is one of the key members of the squad and a lovely guy."