The Magpies had a man sent off in a 4-0 thrashing at Manchester City that came just hours after an unsettling bid from Arsenal for key player Yohan Cabaye.
Pardew had said his team were "more than ready" for their opening test at the Etihad Stadium but his plans were thrown into disarray by Arsenal's offer, thought to be £10million, for Cabaye.
The Frenchman was pulled out of the Barclays Premier League game and without him the team struggled, conceding inside six minutes and losing Steven Taylor to a straight red card for swiping at Sergio Aguero.
City were rampant, scoring through David Silva, Aguero, Yaya Toure and Samir Nasri to leave Pardew with much to ponder.
"I would rather focus on what for us has been a tough day," said Pardew in response to questions about Cabaye.
"We have 37 games to go and we need to make sure we don't let this game emotionally scar us."
City have spent close to £90million freshening up their squad for new manager Manuel Pellegrini over the summer.
Such investment puts them in a different league to the likes of Newcastle, but Pardew felt his team showed some spirit.
Although 2-0 down, he thought the Magpies competed well until Taylor's sending off early in the second half.
The defender swung out an arm at Aguero as the pair challenged for a high ball.
Pardew said: "Up until then we had given a very good account of ourselves, against a very good side.
"We tried to be positive and threaten the goal a few times."
Yet had Newcastle goalkeeper Tim Krul not been in good form, City could have won even more convincingly.
Edin Dzeko also spurned a number of chances and Alvaro Negredo had a late goal disallowed.
Pardew said: "I think there are going to be a lot of teams who will struggle here. They have got some fantastic talent.
"When you get the options that they have and look at them on the bench, let's be honest these teams - in terms of finance and quality - make it very, very difficult for the rest of us in the Premier League.
"That was a case in point. There will be better teams than us struggle at this ground, for sure."