A day after finalizing the trade that cleared Michael Pineda's spot in their starting rotation, the Mariners signed a possible replacement in veteran right-hander Kevin Millwood.
Millwood, who turned 37 on Christmas Eve, agreed to a Minor League contract and received an invitation to Spring Training.
Word of an agreement between the Mariners and Millwood came Sunday via his own family, through a posting on Facebook by his sister Erika. The Mariners announced the signing on Tuesday.
"Kevin brings a great deal of experience as a veteran pitcher and will compete for a spot in our starting rotation," executive vice president and general manager Jack Zduriencik said. "His leadership and experience will be a benefit for our young pitchers and we look forward to seeing him in Spring Training."
Millwood went 4-3 last season in nine starts for the Rockies, who returned him to the Majors in mid-August after he had spent most of the year in the Minors in the Yankees and Red Sox organizations.
The Mariners would be the seventh club of Millwood's Major League career, during which he has compiled a record of 163-140 with a 4.10 ERA. He also has a no-hitter to his credit, against the Giants on April 27, 2003 while with the Phillies.
Millwood would likely compete for a spot in a starting rotation that already includes Felix Hernandez, Jason Vargas, newly signed Japanese free agent Hisashi Iwakuma and rookies Blake Beavan and Charlie Furbush and Hector Noesi, acquired from the Yankees in the Pineda trade. The Mariners also have several top prospects who will get a look in Spring Training, including Danny Hultzen, last year's No. 2 overall Draft pick out of Virginia.
A two-time 18-game winner with the Braves in 1999 and 2002, Millwood reportedly had a chance to remain with Colorado on a $1 million contract with an additional $1 million in incentives.
Tom Singer is a national reporter for MLB.com. Follow @Tom_Singer on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.