Cincinnati Bengals defensive end Carlos Dunlap has missed the team's last few practice sessions after suffering a concussion earlier this week, ESPN have reported.
It is not yet clear how bad the injury is, or how long the 24-year-old will be out of action for, but the Bengals have made it clear he will not play for the time being.
With just over a month to go before the NFL season begins, they are not keen to rush the former Florida College player back into action too soon, and will assess the injury before deciding when they want to bring him back.
Dunlap recently signed a new long-term contract with the Bengals, and the deal is worth $40m over five years, with a possible addition of $4.5m dollars in escalators.
He has been with the Bengals since his first year in NFL in 2010, and has made 20 sacks and 87 tackles in his three seasons with them.
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