The Seagulls were 3-2 winners at the AMEX thanks to a first-half onslaught.
"It shifts the mood, but it doesn't change anything for this season. It's going to be a tough season. The three teams who came up are capable of taking points, and this division is as competitive as ever," he told Sky Sports.
"If we think it's going to the same, or easier than last season, it's not going to be. We have to make sure our level of performance, if not at this level, needs to be somewhere near it, to get points."