Atletico and the Belgian are keen to extend their loan arrangement into a third season, with the Madrid giants set for Champions League football.
However, Punto Pelota says Chelsea have asked for "more time" to consider all options.
"There is still nothing (about my future). Still the same as I have said in recent weeks. I expected to know this week or in these last days, but they have asked for some more time.
"Maybe they will sign a new coach. I do not know. But I have to wait a little longer," revealed Courtois.