Hummels has been linked with Barca this past week.
"There is no truth in these stories," Hummels told Sky Deutschland. "Of course, every now and then there are bits of reports. That's the same about other players too.
"Then, there are some people claiming they are in touch with Barcelona. And they tell the media about it.
"We did experience that back in April. Three days later, this was written in a newspaper."
He added of the rumours: "Borussia Dortmund did not know anything, we did not know anything. It's just a story because someone started to care about the rumour."
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