The Brazilian escaped censure for kicking out at the Bluebirds midfielder after 33 minutes of a first half in which he failed to complete a single pass.
Following receipt of the referee's report, and because a free-kick was awarded at the time, the Football Association will not be looking into the incident further.
Newcastle were ultimately reduced to 10 men when substitute Isaac Hayden saw red for a clumsy lunge on Josh Murphy.
Kenedy had a chance to be the hero after Sean Morrison handled Yoshinori Muto's cross, only to see his tame effort saved by Neil Etheridge.
Newcastle have yet to win in the Premier League this season, after losing 2-1 to Tottenham in their opening encounter at St James' Park.