Gnabry played the final 20 minutes of Arsenal's 6-1 thrashing of Coventry, exciting the Emirates crowd who cheered his every touch.
Here is what supporters have been saying about the starlet on Twitter...
@alex49: The Ox and Gnabry are brothers from another mother right? Exact same type of player. Gnabry a very special player, as is the Ox
@arsedna: saw Gnabry for all of 15-20 minutes today, but he was amazing. Similarities to Ox are never ending
@crisjames1: Gnabry looked SHARP. People around me all excited about him too. Everyone seems to know he is good
@jamie_at_six: Gnabry is going to become one hell of a player.
@gooneruk: Speaking of future stars, how good is Gnabry's touch?! He's got some serious skills.
@r_zana: Gnabry looked very good when he came on. Super excited about him!
@donarabs: But i saw Gnabry live. Man oh man im excited by him.
@qa_kal: Serge Gnabry is well equipped to play in the 1st team.
@olipricebates: by the way, Serge Gnabry what a player!
@totallyarsenal: It doesn't matter that it's 'just' Coventry. Serge Gnabry is seventeen years of age. He is literally tearing their defence to pieces.
What did you think of Gnabry's cameo? Can he break through this season?