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Pique and Messi shared a touching friendship during their trophy-laden spell together at the Camp Nou.
But the six-time Ballon d'Or winner will leave the Spanish club after 21 glorious years.
His departure has rocked the La Liga outfit, with Barca players of past and present paying tribute to the legendary Argentinean.
Including current Barca defender Pique, who uploaded a tear-jerking statement in response to Messi leaving the club.
In an Instagram post, he wrote: "Nothing will be the same again. Neither the Camp Nou, nor the city of Barcelona, nor ourselves.
"After more than 20 years at the club, you will stop wearing the Barça t-shirt. Reality, sometimes, is very hard.
"We met in 2000, we were 13 years old and a career ahead. What career! The mother who gave birth to us! If we had designed it at that time, it was impossible to do it better. A f**king madness!
"In my first season, after returning to FC Barcelona, we won the treble and you became the best player of all time. From Rosario to touch the sky in Rome. There began the legend. What came after is history. And what good is it happened!
"Now you leave, but I know that one day you will come back. There are things to do pending. Pass it well, enjoy wherever you go and keep winning like only you know how to do.
"Here we are going to miss you. I love you Leo."
The 34-year-old superstar appears close to signing a lucrative deal with Paris Saint-Germain.
Stay tuned to SPORTbible for the latest information regarding Messi's next move.
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