Leeds United head coach Marcelo Bielsa admitted defender Aapo Halme "played at a good level" during the Whites 1-0 victory over Sheffield United at Bramall Lane.
The 20-year-old central defender was thrust into the action in the 19th minute as United captain Liam Cooper hobbled off the pitch with a knee injury that occurred off the ball.
Leeds are yet to issue an update over Cooper's condition with the centre-back set to undergo scans but Marcelo Bielsa called it an "important" injury following the win.
Halme may yet be required to provide defensive cover in the coming weeks with Bielsa's options growing thinner with each passing game. Luke Ayling and Gaetano Berardi remain sidelined with long-term issues with Cooper the latest to join them in the Thorp Arch medical room.
Pontus Jansson returned at the weekend from a foot problem which saw him miss games against Bristol City and Reading which saw Halme handed his debut and midfielder Kalvin Phillips drop into the heart of defence.
Halme, who was making only his second senior appearance on Saturday lunchtime, made the move from HJK Helsinki in January but spent time injured himself which resulted in eight months on the sidelines at Elland Road.
The Finnish Under-21 international appeared a cool head at the back and Bielsa was left pleased by his showing in south Yorkshire in what were difficult circumstances, saying afterwards: "He had a balanced game. He was not impressed by the importance of the game.
"He played at a good level when he had to play aerial balls and recover the ball. Regarding the use of the ball, he had the same inconvenience as the other players of the line of three.
"We took this game as a possibility to compare it with the game against West Bromwich [Albion] and we had special interest in not making a mistake."