Brown went down on a third-down incompletion early in the third quarter.
The ball from Drake Maye was low, leading to Seahawks cornerback Nehemiah Pritchett landing awkwardly on Brown’s lower leg/ankle area to break up the pass.
Brown stayed down before he limped off the field and went into the sideline medical tent.
So far, Brown has three catches for 26 yards on four targets.
Tight end Hunter Henry was previously in the tent for what was apparently a concussion check. He had been hit hard and had his head hit the turf following a reception early in the third quarter. But he was cleared and came back on the field later in the same drive.
The Patriots added a field goal from Andy Borregales on their first drive of the second half after a roughing the punter penalty put them back on the field. Borregales’ 50-yard attempt sailed through the uprights to give the visitors a 10-0 lead.