The Manchester City boss has stated that the Spain international’s sanctioning will help the player change his approach.
The former Atletico Madrid striker will miss today’s top-of-the-table clash at Stamford Bridge after being reprimanded by the FA for violent conduct against Liverpool in midweek.
The 26-year-old was adjudged to have stamped on Emre Can during the Blues’ Capital One Cup clash on Tuesday night.
The Chilean boss has revealed that he feels the disciplinary action will help Costa to change his game for the better.
"It will be a good thing for him to change a little bit in the future," Pellegrini stated at Friday’s press conference, published in The BBC.
"He doesn't need to play in that way because he's a very good player."
Costa is the division’s top goalscorer this season with 17 strikes in 19 games, but has been embroiled in some controversial moments due to his aggressive approach on the pitch.
The Brazilian-born forward will also miss clashes with Aston Villa and Everton in upcoming weeks.