The Cardinals' bullpen renovation has begun.

The team is adding Carlos Martinez and Ryan Helsley to the roster and has designated Luke Gregerson for assignment and sent Dominic Leone to Memphis.

Martinez had been rehabbing his way back from a shoulder injury in the minor leagues, and Helsley was up with the club for a stint earlier in the season.

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In 6.2 rehab innings between Peoria, Springfield and Memphis, Martinez allowed one run on five hits, walked four and struck out six.

As a reliever last year Martinez went 2-0 with a 1.47 ERA in 18 and 1/3 innings. 

In two years with the Cardinals, Gregerson had a 7.36 ERA. This season he had allowed five runs in just 5 and 2/3 innings.

Leone has an 8.02 ERA for the Cardinals this season.