The match was played on Thursday night, with Ez Abde and Antony scoring for Betis in the first half before Luca Ranieri pulled one back for the visitors.
Pellegrini praised his team's performance, saying they played a very complete game and created many scoring opportunities.
Betis had few chances to score against Fiorentina, except for a header in the first half, and conceded a goal in the second half.
Pellegrini expects a balanced match in the second leg, as Fiorentina plays with good players and has a strong team.
He believes his team has the personality to go all out and win the game, just like they did in the first leg.
Pellegrini is not concerned about the goal scored by Fiorentina and is focused on winning the game in the second leg.
He emphasizes that the team's performance was good and they created many chances to score.
Pellegrini is happy with the team's ability to create scoring opportunities against a team that defends well and attacks a lot.