Newcastle travelled to Craven Cottage looking to record a third Premier League win in a row, but were unable to frustrated by a resilient Fulham defence and fell to a 1-0 defeat, with Ashkan Dejagah scoring the only goal of the game in the 68th minute.
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Striker De Jong started alongside Papiss Cisse, but the duo were starved of service in their first game without banned manager Alan Pardew, who started a three-game stadium ban.
And following the game, De Jong apologised to the fans who travelled to London and hailed their "amazing support."
"We wanted to win this game, of course," he told the Shields Gazette.
"I think the game was quite boring for the fans – not much happened – and we didn't score from the moment when we had a big chance.
"Afterwards, they got a good chance and scored.
“[But] it was amazing support. There are always big numbers at the away games.
“You can always hear them during the game.
“We wanted to win this game for them. We wanted to give a little bit more.”
The defeat meant Newcastle dropped to ninth place in the league table behind Southampton, although they do have a game in hand on Mauricio Pochettino's side.