Balboni is in the Royals' camp as a non-roster player, making one last effort to resume and extend his major league career.
Invited Joe Price, pitcher, to spring training as a non-roster player.
The clubs also had the option of drafting one non-roster player for $25,000 from each established franchise.
He will report as a non-roster player, sign a minor league contract and earn another $250,000 if he makes the team.
The deal included an invitation as a non-roster player to spring training with the club.
Carlton, who at 42 is being given a chance to make the team as a non-roster player, threw 24 pitches, six of them balls.
He is invited to spring training with the team as a non-roster player.
The 22-year-old right-hander, who made the team as a non-roster player, yielded six hits in five and a third innings.
Invited Backman to spring training as a non-roster player.
Gibson was part of 19 non-roster players to get invited to spring training in 2011.