Promising right-hander Josh Staumont, the Royals' No. 10 prospect according to MLBPipeline.com, and first baseman Ryan O'Hearn, the No. 7 prospect, also received invitations.
Sanchez, 34, had a 7.76 ERA with the Royals in 2012 before being traded to the Rockies that July. He has not pitched in the Major Leagues since his '13 season with the Pirates.
Alburquerque, 30, pitched for the Tigers from 2011-15. His best season came in '14, when he had a 2.51 ERA in 72 games. He pitched two games for the Angels in '16.
League, 33, had 37 saves for the Mariners in 2011 but has not pitched in the Major Leagues since '14, when he had a 2.