"When I heard it was the Cubs, I was ready to go," Valbuena said.
The Cubs claimed the left-handed-hitting infielder off waivers from the Blue Jays, and he was at Wrigley Field Thursday and on the Opening Day roster. The Cubs have decided to go with 14 position players and 11 pitchers at the start of the season.
Valbuena, 26, can backup at second and short. A career .226 average in the big leagues with the Mariners and Indians over parts of the last four seasons, he was traded from Cleveland to Toronto last November and was in Blue Jays camp this spring, where he batted .163 in 24 games.
"Now I want to do the best job I can do," Valbuena said Thursday. "I'm so happy."