Krueger, who replaced Phil Housley as coach May 15, has his players fired up long before the Sabres open the season Oct. 3.
Forward Jeff Skinner said he was excited by Krueger's enthusiasm in their conversations and that it "can be infectious and it can sort of spread from him on down."
Krueger also has the Sabres believing in his on-ice plans, which include being aggressive pressuring the puck and using their speed.
"Talking to Ralph, he's got some really good ideas on how to play, and it's a really young and exciting team," said new forward Marcus Johansson, who signed a two-year contract July 6.
Krueger was 19-22-7 with the Edmonton Oilers in 2012-13, his only NHL season; coached Switzerland to an upset of Canada at the 2006 Torino Olympics; and helped Team Europe reach the championship series in the World Cup of Hockey 2016, which it lost to Team Canada.
"Dealing with that pressure together with the players and finding ways to perform under that pressure," Krueger said, "I think that's what the National Hockey League season is all about."