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Mateo Kovacic came on as a substitute in the game against Brentford.
Kovacic replaced the injured Conor Gallagher, and played from the 16th minute until the end of the game.
Kovacic impressed in midfield, and Blues legend Gianfranco Zola was pleased with his display.
Zola also hailed Thomas Tuchel for the way he used Kovacic, as he believes that it has made the Croatian international a top player.
He said: “He’s a player that has become very consistent. First of all he barely loses the ball, he’s always in control and under pressure you can pass the ball to him, he never loses it. He’s always very creative.
“He’s a player who has improved so much playing in that position. I have to say fair enough to Thomas Tuchel; he played him in that position and it suits him so well.”