"I found out from my team-mates," the midfielder said. "After training I heard them chanting my name and I didn't know why. That was when they started congratulating me."
Spain's latest squad announcement also included confirmation that Luis Enrique will not take charge of their upcoming games against the Faroe Islands and Sweden for personal reasons, but he will continue as coach.
Told he was lucky to walk again and could have lost his leg, Cazorla chose not to retire, instead moving to Villarreal from Arsenal last year.
The 34-year-old's call-up comes after he was one of Villarreal's stand-out players this season, helping them avoid relegation with four goals and 10 assists in 34 appearances. He has only missed three La Liga matches.
"If someone had told me this would happen at the end of the season, I would never have imagined it," Cazorla said.
"It's almost like being called up for the first time because it's something so unexpected. I'm going to enjoy it a lot."
Spain play European Championship qualifiers against the Faroe Islands on June 7 and Sweden on June 10.
The midfielder's last international appearance came when he scored in a 2-0 friendly win over England in November 2015.
"I think I can contribute," added Cazorla. "During the years of injury I always wanted to play again and I wanted to play at the highest level."
Luis Enrique was unable to attend the squad announcement at Las Rozas and will miss the upcoming games due to the same personal problems that prevented him taking charge of Spain's last fixture against Malta.
Molina said there was no timetable for Luis Enrique's return but insisted speculation he might stand down was false.
"That has not been proposed," Molina said. "The commitment of the federation to Luis Enrique is total. That commitment is mutual and will continue. On our part there is no doubt about that."
Luis Enrique's assistant Robert Moreno oversaw the announcement of the squad, which included recalls for Real Madrid's Isco, who was left out in March, and Real Sociedad striker Mikel Oyarzabal, who was last selected in May 2016.
Goalkeepers: David de Gea (Manchester United), Kepa Arrizabalaga (Chelsea) and Pau Lopez (Betis) Defenders: Dani Carvajal (Real Madrid), Sergio Ramos (Real Madrid), Mario Hermoso (Espanyol), Diego Llorente (Real Sociedad), Inigo Martinez (Athletic Bilbao), Jordi Alba (Barcelona), Sergi Roberto (Barcelona), Jose Gaya (Valencia), Jesus Navas (Sevilla) Midfielders: Sergio Busquets (Barcelona), Rodrigo Hernandez (Atletico Madrid), Dani Parejo (Valencia), Isco (Real Madrid), Fabian Ruiz (Napoli), Santi Cazorla (Villarreal) Forwards: Mikel Oyarzabal (Real Sociedad), Rodrigo Moreno (Valencia), Marco Asensio (Real Madrid), Iago Aspas (Celta), Alvaro Morata (Atletico Madrid).
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