Reds boss Rafael Benitez is reportedly willing pay close to the players buy-out clause which is set at £10.5 million for the 20 year-old.
Paolino Oscar, the players agent, told UOL Esporte, "They had revealed interest in the past one or two months, when the window was open.
"Now, I find that it was more difficult because everything is closed in Europe." he added.
"It is in Sao Paulo’s hands and it is they who decide. If Aislan is told to leave, very well. If not, that is good also."
"I have respect for Sao Paulo and I do not do blackmail, therefore it is the club who must make the primary move."