"It's good to be at the back looking at the front and seeing the two Dembas up front," Simpson told talkSPORT.
"[Cisse] has come in and he seems like a top lad. His English isn't great but he's learning and Demba Ba is helping him.
"To have those two back earlier than expected has given us a big lift and they look dangerous up front. We haven't seen too much of Papiss but he worked hard and he looked like he was holding up [the ball] well."