Luis comes off contract at the end of the month.
"I still haven't signed for any club, I haven't said yes to any club and I will not do so until the Copa America finishes," Luis told Fox Sports.
"I've given my word to the Brazilian national team [to not announce future] .
"I ask the Flamengo fans and all the journalists that want to know the futures of all the players here to be patient.
"Many are going to change team, but speculation doesn't help."