Ünal game on as a substitute for Tornike Okriashvili in the 71st minute and looked lively in the 18 minutes he was on the field.
The game ended a 0-0, Genk take on Westerlo next weekend at the Cristal Arena.
The young striker came close to scoring in the 90th minute when he got on the end of a cross into the box.
The 18-year-old striker will not be playing in England next season due to not having the necessary work visa requirements, he would have to be granted special permission by the FA to play football in the Premier League for the 2015-16 campaign.
Ünal holds the record of being the youngest player to ever score in top-tier football in 2013 when he scored against Galatasaray and made his international debut aged 17.