Bristol City manager Steve Coppell believes his players cannot afford to underestimate promoted Millwall when they meet at Ashton Gate.
While expectations have risen at the club this season, they face a Millwall team on a high after returning to the Championship following their play-off success over Swindon.
But Coppell told the club's official website: "They have had two terrific seasons and have worked ever so hard to be where they are. They aren't going to want to fritter away that hard work - they'll come here all guns blazing."
He added: "It's a massive challenge for us on the opening day of the season. We won't have a bedding period; if we're not playing at the same intensity as Millwall then we're going to suffer.
"We must be right on our game from the first whistle."
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