The Portuguese club have secured the services of the Brazilian striker on a season-long deal.
Benfica have now issued a statement to the Portuguese stock market in which they confirm a compromise has been reached with Barcelona to sign the 20-year-old on a season-long deal, with the option for another year.
According to news daily A BOLA, Keirrison is already flying to Lisbon and could be presented before the end of the day.
The former Palmeiras man is Benfica's third striking reinforcement this summer, following the arrivals of Javier Saviola and Weldon.
Luís Mira, Goal.com