The Cubs recalled Frank Schwindel from Triple-A Iowa in a corresponding move. They also selected lefty reliever Conner Menez from Iowa and optioned Adrian Sampson there.
Robertson has gotten off to a strong start this season, holding a 1.50 ERA in 11 appearances, converting all five save chances.
Schwindel rejoins the Cubs a day after he was optioned to Iowa.
The Cubs added Menez in the minor-league portion of the Rule 5 Draft last December. In seven games (one start) with Iowa this season, he holds a 2.16 ERA across 16 2/3 innings.
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Source: Yahoo Sports