Barcelona signed the Brazilian striker in a €14million deal in the summer, but sent him out on loan immediately.
Keirrison has played just 136 minutes for Benfica so far.
Begiristain told Sport: “We are tracking Keirrison’s progress, as we do with all the players that belong to us.
“The idea is that he remains with Benfica for another year.
“We have a good relationship with the club.”