2/1 UPDATE:
The Cubs have signed OF Peter Bourjos to a minor league contract. He has been assigned to AAA Iowa and will receive an NRI to Spring Training.
As a post-2017 MLB Article XX-B free-agent, Bourjos will receive an automatic $100,00 retention bonus and an automatic "opt-out" on June 1st if he is not added to an MLB 25-man roster by Opening Day.
NOTE: If an Article XX-B MLB free-agent signs a minor league contract at least ten days prior to MLB Opening Day, and then is either not released by 12 PM (Eastern) on the 5th day prior to MLB Opening Day or added to an MLB Active List (25-man roster) or MLB Disabled List by 12 PM (Eastern) on MLB Opening Day, the player automatically receives a $100,000 retention bonus, and the player can unilaterally opt-out of the minor league contract on June 1st if he has not been added to an MLB Active List (25-man roster) or an MLB Disabled List by that date.