Depth of Field – Take a telephoto lens without blur in the background?

Is it possible to photograph a person with a telephoto lens (for example, 85 or 135 mm) without background blur (or at least with minimal blur)?

I plan to take portraits of someone on the roof (with city skyline in the background). Although I want to get the compressed and flattering aspect of telephoto lenses on my subject's face, I want the background of the horizon to remain clear.

Would be grateful for any help!