The Blues are hoping to scoop their first silverware of the season on Saturday evening as they face off against Leicester City at Wembley, and Tuchel will be boosted by midfielder Kovacic returning to full fitness.
"It's huge because Mateo has everything we need in the midfield," said Tuchel. "Experience, power, he can beat players, he has physical ability and has played big games in the Premier League.
"When we missed N'Golo [Kante] and Mateo, we lacked a lot of quality, energy and experience. Billy [Gilmour] did a huge job in huge games but it's not fair to compare him to these players because they have more experience and are a step ahead in their development.
"It's big news that [Kovacic] is back because he's a big guy in the dressing room around important matches."
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