Campbell has now struck in consecutive games after returning from long-term knee injury.
"It's great to have Fraizer back - he's like a new signing. He's strong, quick, runs the channels and his goal tonight was top class," midfielder Gardner told safc.com.
"He's a player who's been missed and we're so glad to have him back.
"He's always on the move and then there's Sess, who turns so well in midfield and runs at people. He is one of the best players in the world at doing that.