A famous Argentinian DJ claims he's been receiving death threats and nasty insults this week ... after he says fans believe he was the reason Lionel Messi came down with COVID-19.

DJ Fer Palacio -- who has over 1 million followers on Instagram -- posted a video message explaining the situation on Sunday ... saying soccer aficionados are blaming him for Messi's positive test after the two were spotted partying together late last week.

Play video content ADDRESSING THE PUBLIC

"I am a trend on Twitter because Messi tested positive for COVID-19," the DJ said.

"They relate this to me saying that I infected him. They have even called me 'murderer.' I have a lot of very bad private messages."

The 31-year-old, though, implored fans to stop ... saying it's just not possible for him to have given the soccer superstar the virus -- because he doesn't have it.

"Yesterday I got tested because I have to travel to Uruguay," he said showing a picture of a negative COVID test, "and I do not have COVID-19."

Messi, meanwhile, is isolating away from his Paris Saint-Germain team ... after the squad confirmed on Sunday he and three of his other teammates had the virus.

The seven-time Ballon d'Or winner appears to be in good spirits following the diagnosis ... sharing a few encouraging words at the beginning of the new year.

"I can only give thanks for everything that I had to live in this 2021," Messi said on social media. "Even more so when many people had a really bad time because of the s****y virus that never ends."

"Hopefully 2022 brings a lot of health, which is what I wish you all for the new year. Hug to everyone!!!"

ncG1vNJzZmivp6x7tbnZZ5qopV9nfXN%2BjmloaGhjZK6zs8Snq6KmlWKxq3nRnpqeoaaawG6wxJqroWWknb%2BmrdOsZJ%2BZnqh6rbXOp5ylZZ2awLS1jJymr6GUYn56ew%3D%3D