Uniao Leiria striker Carlao is attracting Spanish Liga interest.
The 23 year-old Brazilian has impressed at Uniao Leiria since his arrival last season from Sao Cristovao.
Record says scouts from Rayo Vallecano and Real Zaragoza were present for Uniao Leiria's clash with Naval to run the rule over Carlao, who struck in the 2-0 win.
The striker's contract carries a buyout clause which is understood to be in the region of £3 million.