The 18-year-old started alongside Cristiano Ronaldo and Antony in the Reds' attack as we beat Sheriff Tiraspol 3-0 at Old Trafford.
Garnacho became the first of the club's 2022 FA Youth Cup-winning side to make the United XI in a competitive fixture and sparkled down the left flank, showing drive and desire to beat his markers and wreak havoc.
The teenage prospect proved just why he earned the manager's trust to start at the Theatre of Dreams.
"I think it was a good performance from him. He did what I expected him to do," Ten Hag said afterwards.