Transfer sagas are complicated affairs.
One single deal requires a number of initial bids, protracted contract negotiations, agent fees, infinite speculation and more.
But when one move is completed, others are usually sped up as a result. It is a sort of chain reaction.
The German's move could only materialise after Gareth Bale had finally joined Real Madrid, while the transfers of Edinson Cavani from Napoli to Paris Saint-Germain and Gonzalo Higuain from Madrid to Napoli also indirectly played their part.
One man whose transfer talk has taken up countless column inches this year is Luis Suarez, even though he has ultimately stayed at Liverpool. According to the Uruguayan, moreover, he will be staying put for the rest of the season.
But what then?
Suarez has placed his words carefully. The 26-year-old has not said anything about staying at Anfield forever. And nor would Liverpool fans expect him to.
He has made his ambitions clear in the past, while he has given enough to the Kop for Reds fans to take a step back and say 'fair enough, thanks for the ride.'
Once he has seen out the campaign with Brendan Rodgers' side, he will be free to choose from a barrage of potential suitors - and here is where the chain reaction might just come into play once more.
Suarez, it would seem, has had his heart set on a move to Real Madrid for quite some time. And the Spanish giants have, in patches, reciprocated that desire.
Adding Bale to their ranks was one step on their ostentatious ladder. Suarez could be the one to follow.
And so we have another big-money move to the Bernabeu. But, of course, the club cannot pay for the player with thin air. Transfer funds are needed and the not-so-fresh stars will be the first to be shown the exit door.
This year, it was Ozil - who had been at Madrid for three years. Next year, the prime candidate is Karim Benzema.
The Frenchman has been in the Spanish capital since 2009 and has long been desired by a certain Arsene Wenger. Indeed, recent reports have gone as far as calling Wenger 'obsessed' with the Frenchman.
So why not make the move? Madrid have had no problem dealing with Arsenal before.
But it does not stop there. No, with Liverpool now without their talismanic, world-beating striker, Rodgers and co. will need a new man to partner Daniel Sturridge. How about Jackson Martinez?
Arsenal, of course, will also need to recoup funds for the Benzema transfer, so players will be offloaded from the Emirates Stadium. Which ones? Take your pick.
Either way, the chain reaction will have been started and, by this point, nothing would be standing its way.
image: © Jan S0L0