Vontaze Burfict leaves game after one series

GLENDALE, Ariz. -- A hamstring injury forced Cincinnati Bengals linebacker Vontaze Burfict's night to come to an end after just one series Sunday in a preseason game against the Arizona Cardinals.

Following the early first-quarter injury, the Bengals announced that he wasn't expected to return. He had two tackles before leaving the game.

Burfict's injury comes at the end of a week in which he didn't participate in the final three practices. He was held out of Wednesday, Thursday and Friday's workouts after falling ill. Coaches said he had the same stomach virus that others, such as running back BenJarvus Green-Ellis and cornerback Dre Kirkpatrick, have battled in recent days.

In addition to barely practicing, Burfict's week also featured news that he had agreed to a four-year contract extension that would pay him about $20 million. The reports may have been premature, though. Burfict still hasn't signed his contract, and the Bengals have yet to make the extension official.