Apr 17, 2009 9:33 AM EST

Wizards guard Gilbert Arenas has warned some of his young teammates that they need to get serious this offseason in preparation for the 2009-10 season.

"We've just been a goofball team for a while. It's fun when you're winning. But when you're not winning, it's depressing a little bit," Arenas said. "To be honest, I'm a goofball. But when I step inside those lines, it's serious. Some of them don't know how to turn that on and off. I told them, it comes with time. You've got to put your work in in the summer because we're coming at you."

Washington was 19-63 this season, while Arenas missed a majority of the season with chronic knee issues.

"He said next year's going to be totally different, no playing around," Andray Blatche said. "Gil surprised me with it."

Via Washington Post