(CNN) The New England Patriots are gearing up for a big showdown against the Houston Texans on Sunday, but they may be down a few key players thanks to \what appears to be a flu bug that has struck the team.

Cornerbacks Stephon Gilmore and Joejuan Williams, safety Patrick Chung, linebackers Jamie Collins Sr. and Dont'a Hightower, offensive lineman Isaiah Wynn and Jermaine Eluemunor, and tight end Ryan Izzo were among the players listed on the team's injury report having missed practice with an illness.

Left tackle Marcus Cannon was listed with an illness but practiced on a limited basis.

Safety Devin McCourty told WPRI that he hasn't seen anything like it in his 10 years with the Patriots. "We had guys come in, you'd look in their eyes and you could just tell they were out of it," McCourty told WPRI.

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