The Dutchman believes that the on - loan 25 - year - old possesses the fighting spirit required for a potential relegation battle .
The on - loan 25 - year - old has scored one goal in four appearances for the Wearside outfit .
The Dutchman believes that the on - loan 25 - year - old , who has scored one goal in four appearances for the Wearside outfit , possesses the fighting spirit required for a potential relegation battle .