The USA international has assessed the early impact of the Austrian and Irish internationals since their recent arrivals at the Britannia.
"Marko is a guy who's a game changer and we needed that," says Cameron.
"He gets the ball and you don't really know what's going to happen.
"Stephen Ireland has come in and is still getting fitter, but I think he's a player who makes other players around him better because he's such a clever player."
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