Steve Bruce's side finished second in the regular Championship season to ensure a return to the top flight after a three-year absence.
It will only be their third campaign in the Premier League after an eventful two-year stay in the top division between 2008 and 2010.
Koren, who joined the club from West Brom three years ago, insists they are more than capable of holding their own amongst the big boys next season.
"Survival is our main goal and we all believe that we can make it," Koren told Sportal. "But it is too early to speak about that. Now we just want to enjoy what we achieved this season.
"I'm sure we have to lift everything to a higher level. The board will have to make sure we strengthen the team.
"Now we have to rest and then prepare well for the new season."