Morrow's standout postseason included four scoreless appearances against the Cubs in the NL Championship Series.
Jeff Passen of Yahoo Sports has added that it is a two-year deal, with an option for 2020, pending a physical. Morrow will join Tyler Chatwood as new additions to the Cubs bullpen as Chicago recently signed Chatwood to a three-year deal.
During the 2017 season, the Cubs bullpen struggled aside from closer Wade Davis. Morrow was wiped by the end of the postseason, even blowing a Game 5 lead for the Dodgers in the World Series. He will be looked to as the team's closer unless the Cubs bring back Davis, which isn't expected as Davis is believed to desire $13 million to $15 million annually on a multi-year deal.
On the eve of Major League Baseball's Winter Meetings, the Chicago Cubs went and locked up one of the most sought-after relievers on the free-agent market. In the regular season, he had 35 appearances with a 2.06 ERA and a flawless 6-0 record with 50 strikeouts in 43 2/3 innings.
An 11-year veteran with stops in Seattle, Toronto, and San Diego along with Los Angeles, Morrow has a career 51-43 record with a 4.05 ERA.
He was primarily a starter from 2010 through 2015 before moving into a bullpen role with the Padres in 2016.
The Cubs have been pleased to address some pitching needs without having to move any of their core young players.