The 27-year-old was linked with a move to Juventus in a swap deal involving Mirko Vucinic that collapsed, and rumours persist that he will depart Inter before the transfer window closes.
"Inter, it is you who put me up for sale without asking me," he wrote on Twitter. "I was feeling calm and good at the club. I want clarity and respect - for me, my agent and the supporters.
"For the fans, I just want to thank you because you have been affectionate and respectful towards me and appreciated my work.
"If I have to leave, you will always be in my heart because at Inter I made a dream come true. If I remain, I will use all my power and all my heart to help Inter win."
Guarin joined Inter from Porto in January 2012.