Lakins was optioned to Triple-A Norfolk after Saturday's doubleheader against the White Sox, Roch Kubatko of MASNSports.com reports.
The 26-year-old served as the 27th player for Saturday's twin bill and will return to Triple-A after delivering 1.1 scoreless frames in Game 1. Lakins has a 6.75 ERA in 17 appearances in the majors this season.