The 46-year-old finds it flattering that his players are linked with a move to the Camp Nou, but insists they are nothing more than rumours
Despite their success over the past three seasons, BVB have lost many of their star players, including the likes of Mario Gotze, Shinji Kagawa, Lucas Barrios and Nuri Sahin - now back at the club.
The most recent rumour links Hummels with a €35 million switch to Camp Nou, although his coach maintains there is no truth in the story as they have not agreed a price with the Catalans.
“I’m not annoyed by this news,” he told reporters. “It’s totally normal. I think it’s cool that players in our team can see themselves playing for other top clubs.”
Hummels arrived at Dortmund from Bayern Munich in 2009, and has been with the club since, with his contract expiring at the end of the 2016-2017 season.
Klopp will hope to avoid losing another integral part of his team, with Robert Lewandowski already having decided to leave the club when his contract expires next summer.
“Mats Hummels is probably popular with lots of clubs. I can imagine that being true," he added.
“But the rumour that we agreed on a certain price with Barcelona is too much.
“That’s the point where the rumour becomes annoying.”
During the summer, Hummels admitted to being "fascinated’" by Barcelona, but had made no plans surrounding his future.