Hundreds of players moved clubs this transfer window, and over £1 billion was spent in the Premier League alone. However, no transfer eclipsed Manchester United's capture of Paul Pogba for a world record £89 million fee.
The Frenchman's arrival at Old Trafford from Juventus came after weeks of speculation and a reported big-money battle with Real Madrid.
However, according to Barcelona's director Albert Soler, Jose Mourinho and co. could have been left watching on this summer as the 23-year-old moved to the Camp Nou, had the Catalan club taken advantage of a deal agreed with Juventus in 2015.
Back in February, when Pogba was still in Turin and Manchester City were rumoured to be favourites for his signature, there were rumblings that Barcelona had an agreement with Juventus that they'd get first dibs on the midfielder when the time came to cash in.
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Now, as reported by the Mirror, Barca's director has confirmed the dramatic detail whilst also explaining just why the club's hierarchy decided not to take advantage of their "priority option".
"Last year we reached a deal with Juventus for us to have a priority option when they sold Pogba," he said.
"This summer we decided that there were players that suited us better on a sporting level.
"The idea of the board was that nobody would be able to get ahead of us in the market...It allowed us to have options."
It is pretty surprising to hear Soler publicly admit that Barcelona passed up on a perfect opportunity to sign a player many feel could become the best of his generation.
However, if there is one club in the world who could get away with turning down a Pogba deal staring them in the face, it is the reigning La Liga champions.
Already blessed with an abundance of talent in their squad, Luis Enrique and co. eventually decided to use the money they saved from any potential Pogba transfer to bring in a raft of new talent, including: Paco Alcacer, Denis Suarez, Lucas Digne, Samuel Umtiti and Andre Gomes.
Whether quantity over one individual's quality proves to be the correct decision, only time will tell.
What is certain, however, is that Manchester United fans are likely to be thanking Soler and the Barca hierarchy for some years to come.
Pogba's arrival at Old Trafford has ramped up the feel good factor around United at the beginning of the Mourinho era.
After logging a couple of impressive performances already, the Frenchman looks set to ease effortlessly into his role as one of the biggest stars in the Premier League.