The 23-year-old Australian, who joined Fortuna from Melbourne Victory in March, has made only one start for the German 2.Bundesliga leaders since the move.

Kruse has been mostly used as a substitute by Fortuna boss Norbert Meier, making 12 appearances off the bench in all competitions.

Fortuna's superb start to the season, where they sit atop 2.Bundesliga by two points at the halfway point, having lost just once, has made it hard for Kruse to break into the side.

Osieck told Bild earlier this week that the situation was an issue for Kruse who needed regular game time to develop his game.

"For a player of his potential, his current situation is not a permanent solution,” Osieck said.

“He needs to get more playing time and develop the feeling for 90 minutes. His further development ultimately depends on it.”

Osieck added that he wasn't in a position to talk with Meier about Kruse's lack of game time but admitted the young Aussie had matured as a person and player in recent times.