The former Napoli attacker completed his lucrative move yesterday.
"It's been a truly unique and unforgettable five years. Five years that have marked me with fire, for life," wrote Lavezzi.
"When in July 2007 my move to Napoli was confirmed, I knew that the challenge would be tough and fascinating. I was coming to the city, the team, where Diego Armando Maradona had left an indelible mark I felt a huge responsibility.
"'Nothing is forever', say some philosophers, and perhaps, unfortunately, they are right. But, I will try to deny them because of you, Neapolitan friends, you will always be in my heart."