Celtic manager Brendan Rodgers says Yang Hyun-jun made a positive difference for his side off the bench against Rangers on Sunday.
The Parkhead side went in at the break 2-0 down, courtesy of goals from Nicolas Raskin and Mohamed Diomande.
Celtic soon rallied, however, with Daizen Maeda and Reo Hatate levelling things up with 15 minutes to go.
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Then, in the dying embers, Hamza Igamane came up with an unstoppable strike to give Rangers all three points.
Rodgers made two alterations in the game itself, one of which saw Yang come on in place of Jota.
The South Korean wasn't afraid to get on the ball on the right-hand side and, indeed, played it first-time into Luke McCowan, who, in turn, found Hatate for Celtic's leveller: "Yang coming in makes the difference for us," Rodgers told Celtic TV.
"He allows us to work better for us on that side.
"I just felt we needed to play with that calmness to get ourselves through, and it looked like it would come for us, but sadly, we got punished late on."
Celtic's lead at the top of the Scottish Premiership was reduced to 13 points after their loss over the weekend.
Rodgers' men are four wins away from winning yet another title and could secure their 55th championship in the first round of post-split fixtures.
