The report (in Portuguese) says
Nélson Oliveira vai representar o Cardiff em 2013/14 a título de empréstimo. O processo negocial entre o emblema da Premier League e o Benfica encontra-se numa fase bastante adiantada, o que leva a crer que exista fumo branco nas próximas horas.
Which, when translated via Google says
Nelson Oliveira will represent Cardiff in 2013/14 on loan. The negotiation process between the emblem of the Premier League and Benfica is a very late stage, which suggests that there is white smoke in the coming hours.
Oliveira, 21, looks set to leave Benfica this summme after already being sent out on loan spells at Rio Ave, Pacos de Ferreira and Deportivo La Coruna.
He's not prolific with 8 goals in 75 league appearances, but has scored a goal for Portugal at full international level.
Source: Cardiff City Online