Chelsea are tracking Flamengo midfielder Airton Ribeiro.

O Jogo says Chelsea and Benfica are among European clubs following the 19 year-old powerhouse.

The stumbling block for any Chelsea deal is Ribeiro's transfer rights, which are not owned by Flamengo.

Traffic owns 35 per cent of his registration, Flamengo 15 per cent and the remaining 50 per cent is held by the player's former club Nova Iguacu.