Troost-Ekong's move to the Little Zebras from Bursaspor was announced last Friday and he was handed a starter's shirt by manager Julio Velazquez two days later, turning out for the entire duration of the tie as his side came from two-goal behind to earn a share of the spoil.
Roberto Inglese and Antonio Barilla had given the hosts the lead but efforts from Rodrigo De Paul and Cote d’Ivoire international Seko Fofana saw Udinese leave Stadio Ennio Tardini with a point in their season-opener.
"Happy to make my debut for Udinese [on Sunday]," Troost-Ekong tweeted.
"Great fighting spirit from the boys to take home a point. We will build on this!"
Udinese, placed seventh with one point, host Sampdoria in their second 2018-19 Serie A match. And Troost-Ekong will hope to have done enough on his debut to be handed his first Dacia Arena appearance next Sunday.