Dez Bryant suffered a concussion during Monday's practice and will miss the Dallas Cowboys' game against the Seattle Seahawks.

"I promise I'm ok Cowboy nation .." wrote Bryant on Twitter.

In two preseason games, Bryant has four catches for 74 yards and two touchdowns, as he returns from a broken foot that required two surgeries and limited him to nine games last year.

Bryant missed five games after undergoing surgery after breaking the fifth metatarsal in his right foot the day after the season opener. He hurt his knee in his second game back and struggled to make an impact as the Cowboys suffered from substandard quarterback play.