Though Mendilibar was initially patient with Mouzakitis' integration, he actually threw him into the deep end with a start against Atromitos for his Super League debut on September 29, 2024, which made him the third-youngest player in the competition's history (top spot belongs to team-mate Kostoulas). Olympiacos were 2-0 victors, and it was their newest starlet who assisted their clincher in the second half. As a reward, Mouzakitis retained his place in the starting lineup for their subsequent domestic and Europa League games, thereafter remaining a regular in the starting XI until the winter break.
In 2025, Mouzakitis has flittered between the starting XI and the bench, though has only failed to feature in five games across three competitions since his debut. One way or another, he is already an important player at Mendilibar's disposal. "Mouzakitis has earned his playing time - he wins his own rewards," he has noted.
After Mouzakitis scored his first senior goal in a late 1-0 win away at APO Levadiakos, the Spanish coach said: "He works hard, just like all the players do. Anyone in the squad has to put in the effort. But beyond effort, he has got the talent and quality that help him even more. We are happy every time he is in the starting lineup and contributes... Now, we celebrate Mouzakitis' goal."
And they were soon celebrating another Mouzakitis goal before too long. Up next were noisy neighbours Panathinaikos in the second leg of their Greek Cup quarter-final, with the tie finely poised at 1-1. Elimination was staring Olympiacos dead in the face when they conceded a 94th-minute penalty, only for Yuriy Lodygin to fluff his lines from 12 yards. Up the other end went the hosts, who scrambled in a long throw before the final whistle. The initial delivery was cleared, but there stood an unmarked Mouzakitis on the edge of the box, and without a second thought, he looped a volley up and in to send the Karaiskakis Stadium into raptures. Right there, a boy became a man, a player became a hero.
"Inspiration is a great feature for a footballer, but when you have skill, it turns inspiration into something meaningful," Mendilibar gushed at full-time. "If you only have inspiration without the ability, you can't achieve what Mouzakitis does - therefore, he's capable. He is a talented player, earning his minutes and proving his quality, which benefits the entire team."
Even though starts have been a tad harder to come by down the final stretch of the season, Mouzakitis is still involved all the same, often coming on from the bench even when not featuring from minute one.
Back in November, Mouzakitis earned his first senior Greece cap and became the eighth-youngest player to debut for the national team. With so many other talented youngsters coming through at the same time, there's now great hope the Ethniki can become a force in Europe and beyond again.