Cornerback Greg Toler jumped on Patrick from behind just as the tight end caught a short pass over the middle. Patrick had to be helped off the field but later was able to put some weight on the knee as he limped along the sideline.
General manager Rod Graves said the injury might not be as serious as it first appeared but that wouldn't be determined until further examination.
The injury came during a practice under the lights at a local high school. The workout culminated with a full-speed goal-line scrimmage dominated by the defense.