Blake, 38, was traded by Cleveland to the Dodgers on July 28, 2008, and played in Los Angeles through last season, which was plagued by three stints on the disabled list and ended with neck surgery. He was released this spring by Colorado.
"I have a ton of respect for Casey," said Mattingly. "He spent a lot of time in the Minor Leagues and never gave up. He played a long time. I always love guys like that. He was so polished when he got here. He just played the game right. He was grateful and thankful to be in the big leagues."
Mattingly said Blake probably has another career chapter if he wants it. Matt Kemp credited Blake with being like a big brother in his early seasons.
"I could see Casey be a coach," Mattingly said. "He'd be good for any organization in a lot of different areas."