Browns Pro Bowl tight end Jordan Cameron is following NFL protocol after sustaining at least his third concussion in three seasons on Sunday.

Cameron was struck in the back of the head by Oakland safety Brandian Ross in the second quarter while making a diving 21-yard catch. He walked to the locker room under his own power and did not return. Cameron had three catches for 40 yards before he got hurt.

The 26-year-old missed one game last season with a concussion and two in 2012. Cameron is in the final year of his contract after catching 80 passes for 917 yards last season.

Browns coach Mike Pettine did not know if Cameron reported to the team's headquarters Monday.

Pettine also did not have medical updates on cornerback K'Waun Williams (neck) or defensive lineman John Hughes (knee).

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