The summer signing from Olympiakos hit 18 goals from midfield last season and Charlton beleives it is only a matter of time before the 29-year old opens his account for the club.
"It is going to be the old London bus thing with Stelios, one goal will take a long time to come but when it does then they will all come at once" Charlton predicted
"He was unlucky not to get it against Villa but it's obvious there are goals in him"