The Royals have lost seven straight games, including all six at home, to start the season with a 3-8 record.
"Baseball is an up-and-down game," Glass said on Thursday. "If you had a losing streak like we have right now in the middle of the season and your record was decent, you wouldn't think much about it. It's the fact that we started this way.
"But it was a long Spring Training, they immediately went on the road and this is the first day off these guys have had in a long time. I talked to them last night, and I think they're loosening up a little bit. They're not the least bit discouraged, they're determined, they're going to get there. This team is too talented, too good and has got too much upside not to perform and have a good year."
Asked if he made a clubhouse speech to the players, Glass said no, but he chatted with players individually before Wednesday night's game against the Tigers.
"I save my speeches mostly for the manager and the general manager," Glass said.
Glass indicated that the Royals will continue to try to sign top players to long-term contracts, as they did during Spring Training with catcher Salvador Perez, shortstop Alcides Escobar and left fielder Alex Gordon.
"We have a great core group of young players that we intend to keep together," Glass said. "I think these young kids are winners, they think they're winners and I think they'll demonstrate that going forward. They're part of a team that wants to win, that is committed to winning and we need them here in Kansas City. So I'm looking forward to not just this year, but the next few years with these kids."
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.