The 18 year old Brazilian has played only three times since signing from Sao Paulo last January.
But Benitez has ruled out recalling another teenager, Romelu Lukaku, from his successful loan spell at West Bromwich Albion, where he has scored nine goals in 22 matches since August
"Romelu went there as a young player and he's doing well. He's getting experience in the Premier League," he said.
"You never say never because you might have a problem, but at the moment the idea is that he stays there and gains more experience."