DenÃ lson Pereira Neves ( born 16 February 1988 ) is a Brazilian football player . He plays for Arsenal . DenÃ lson Pereira Neves ( born on 16 February 1988 in SÃ # o Paulo , Brazil ) is a Brazilian footballer who plays as a midfielder for Premier League side Arsenal and was the former captain of the Brazil under-17 national team .