Gerrard struck Brown with a forearm to the back of the Portsmouth ace’s neck in the second half.
Benitez said, when asked if he feared about retrospective action against Gerrard: “I don’t think so.
“I haven’t seen it but I was asking and I think it was nothing.”
“I didn’t see it. I will speak with Michael Brown and then I will tell you,” Portsmouth boss Avram Grant said.
“They told me the referee was four metres away from this so I think the referee needs to see from four metres what I didn’t from 40 metres.
“Personally I like Steven Gerrard. I think he is a good player and a fair player.”
Liverpool face Manchester United at Old Trafford on Sunday.