A fortnight. That is how long Konstantinos Karetsas has been a Borussia Dortmund player. He's already handed the fanbase something to sing about.
The debut goal at Arsenal did the damage, inside the first half-hour. BVB Buzz watched the fanbase lose the plot over it.
Now he gets to play in front of the Yellow Wall for the first time. If you thought the noise in London was loud, wait for this.
Where he actually fits
Kovac's default is a 3-4-2-1. Two support men float in behind the striker. That is where the €30m has gone.
Karetsas gets one of those berths against Roma, with Samuele Inacio alongside him. Fabio Silva leads the line ahead of the pair.
He's not a winger, so don't expect much touchline work. BVB Buzz picks out his close control in tight spaces and his hold-up play.
The bit that excites people, though, is a passing range that can split a defence open with a single lay-off.
People keep reaching for Jamal Musiala as the comparison. Fair or not, it points at the type of footballer BVB have bought.
Genk got 11 Belgian Pro League assists out of him last season. Two goals and five more assists arrived in the Europa League on top.
He also became the youngest scorer in Greece's history at 17 years and 124 days, against Scotland.
Who has to worry
BVB Buzz already flagged the teammates left sweating after that night in London. Maximilian Beier is top of the list.
Kovac has been trying him at right wing-back, which is nobody's idea of a promotion for a forward.
Carney Chukwuemeka is the other name. Ability has never been the question with him, though staying fit has.
Marcel Sabitzer brings control rather than invention. Felix Nmecha and Jobe Bellingham sit deeper in the shape.
So the two creative berths are the ones truly up for grabs this season. A teenager has already claimed one of them.
That is how it has always worked here. Nobody in the Ruhr is complaining.
The one caveat: Roma won't be as accommodating as a pre-season Arsenal side with one eye on their league opener. Gianluca Mancini and Evan Ndicka don't hand out free space.
If Karetsas finds pockets against that back line, the hype stops being hype.
Verdict: €30m on an 18-year-old playmaker looks steep right up until you watch him receive the ball, so back Kovac to build the front line around him rather than easing him in gently.
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