The Juventus star was a doubt for the tournament after undergoing minor knee surgery in May but played an hour of the South Americans' 3-1 victory over Australia in their World Cup Group B opener on Friday and the 27-year-old has confirmed that he is ready to line up against the reigning world champions in Rio de Janeiro.
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"There's an atmosphere in a stadium like that, [with] the fact we're playing Spain and knowing that, if you win, you're going to qualify from one of the toughest groups in the World Cup.
"[My knee is] fine now. I'm pleased because I made a very quick recovery.
"I thought it was going to be a lot harder for me. Luckily, I made the team for the first match. I hope to show how good I feel in these [upcoming] games and how much I can help the team."
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Chile, however, are stylistically similar to Vicente del Bosque's side and will seek to control the play with what Vidal admits can be a high-risk method.
"Some say we take a suicidal approach. We press very high up the pitch," he observed.
"We try to stop other teams from playing and win the ball back as high up the pitch as possible and, when we've got the ball, we start to play and make the opposition run, which is a good way of finding out if they have same level of intensity as we do when we don't have [the ball]."