Falter was called up as expected ahead of Monday's game against the Dodgers, Todd Zolecki of MLB.com reports.
The lefty is expected to follow right-handed starter Spencer Howard on Monday, as Howard has yet to throw more than four innings this season. Falter allowed two runs in two innings of work in his big-league debut back in April but has pitched very well in six starts and one relief appearance for Triple-A Lehigh Valley, cruising to a 1.82 ERA and a 36.2 percent strikeout rate.