Gabriel has never made an appearance for the Brazilian national team and, although his preference is to still represent the Selecao, he is open to playing for Spain.
"If I don't get any opportunities from Brazil, I'd open the door to playing for the Spanish national team," Gabriel told Esporte Interativo.
"If Spain gives me that opportunity, I'd accept it with a lot of respect.
"I will continue to be Brazilian; if I take that decision [to represent Spain], everyone knows why.
"I am playing really well and there's not been a call from Brazil.
"If the opportunity arises to play at the next Euros [for Spain], I will accept it."