The Brazilian is reportedly creating interest amongst other clubs but has said he would like to stay with the Reds.
"To me it's a disappointment because they know I could sign with other clubs and they still haven't approached me," he said.
"It's disappointing because I feel like I've done enough to earn a contract. Even if they don't want to give me a lot of money they could say: 'Listen, this is what we have for you, if you want to stay this is what we want'.
"I know it's difficult for a coach to choose his players and if he's not happy with me I'm sure there's going to be other clubs.”