Young Hamilton-born midfielder Ben Summers made his Celtic debut in the Premiership leaders' 4-1 trouncing of Kilmarnock this afternoon.
Goals from Kyogo, Daizen Maeda and a Matt O'Riley double had the defending champions on easy street, before Liam Donnelly pulled a goal back for Kilmarnock just before the interval, as Ange Postocoglou's side restored their 12-point lead at the top of the table.
But it will have provided a sweet moment for 18-year-old Summers, who replaced Sead Haksabanovic with two minutes of normal time remaining, while fellow 'B' team star Rocco Vata also got more minutes under his belt, replacing Maeda 20 minutes earlier.
Summers was yet to make his first-team bow until this afternoon, but had been training with the squad for a while, alongside Vata and Bosun Lawal.