Halil worked his way through the youth ranks at Sparta, playing predominantly as a centre forward and progressing to the first team. He played for Jong Sparta Rotterdam in the Dutch third tier and scored 21 goals in 28 games in the 2017/18 season. The 19-year-old progressed to the first team last term and scored ten times in 34 games in the second tier, plus one more as he helped Sparta win promotion via the Play-Offs.

Thomas Frank, Brentford FC Head Coach, said: “Halil is a great talent. He is a striker that does a little bit of everything. He can finish with both feet, he is good in the air, he can run in behind, he can hold the ball up and he scores goals. He is also a young player and there is still more to come from him. Our coaching staff will help him develop and reach the very top level that he is capable of.

“Halil was a player that was available now and we were happy to agree to a deal that meant he would link up with the squad in January. I have a lot of faith in the players we have as our attacking options for the next few months and he will be able to improve and develop in the Dutch league and play regularly. We then look forward to getting him over in January and working with him.”Halil qualifies for Turkey through family heritage and has played for them at Under-19 and Under-21 level. He made his Under-19 debut last year and was in the Under-21 squad nine months later, before his 19th birthday. He has scored three goals in four Under-21 games and has played six games for his country overall.