Santana (hamstring) began a rehab assignment Friday with the Florida Complex League Rays, Ian Cundall of Baseball America reports.
High-A Bowling Green placed Santana on the 7-day injured list June 6 with a hamstring strain. Known for his slick defense at shortstop, the switch-hitting Santana slashed .309/.379/.393 with a career-high three home runs and career-best 10.3 percent strikeout rate while notching 21 steals in 47 games prior to the injury.