A non-roster invite (NRI) is an invitation for a player who is not on a club's 40-man roster to attend Major League camp in Spring Training and compete for a roster spot. Clubs can extend NRIs to their upper-level Minor Leaguers and also include NRIs in Minor League contracts given to free agents in the offseason.
In February 2015, the Kansas City Royals signed left-hander Franklin Morales to a Minor League contract with an invitation to Major League Spring Training. Morales attended Spring Training with the club and won a roster spot with a strong performance. He went on to post a 3.18 ERA in 62 1/3 relief innings for the eventual World Series champions.