The Phillies designated Cairo for assignment Sunday.
A spot on the 40-man roster was needed for the return of Tanner Banks from the 60-day injured list. Cairo was added to the Phillies' 40-man roster just before Opening Day but has yet to make his major-league debut. The 25-year-old infielder has slashed .227/.378/.298 with four home runs, 25 stolen bases and a 90:76 BB:K over 128 games with Triple-A Lehigh Valley this season.