The striker took his top flight tally to nine goals with a game-winning brace against Southampton as Wolves edged closer to surviving relegation.
Larsen will become a permanent Wolves player at the end of the season and Pereira believes the Norwegian will continue improving.
"Fantastic," Pereira said of his number nine.
"He's a player with a strong personality and he came to prove he's a team player and he has quality.
"It was the work he did for the team offensively and defensively.