The Germany international has been linked with Barca this summer.
Director of football Max Eberl told Fohlen-Hautnah: "He's here. Any further comment about it would be too much.
"If the Spaniards like to invent these stories, it's another thing.
"Neither the player nor Borussia Monchengladbach know anything about any interest, a deal or an agreement. We're building something up here, and I think he likes being a part of it."