Keller was out in the flat when quarterback Ryan Tannehill dumped a pass to him. As he tried to make the reception, Texans cornerback D.J. Swearinger broke up the pass, but hit Keller in the knee. Keller immediately crumpled to the ground and was clearly in pain.
The Dolphins signed Keller to a one year contract this season, bringing him to Miami from their AFC East rivals, the New York Jets.
The team huddled around Keller as he was helped onto the cart and taken to the locker room. Swearinger went over and said something to Keller as well.
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We will update Keller's injury whenever further news is known.
If you would like to see an image of Keller's knee bending in a way not natural, there are some screenshots on Twitter already, including this one.