The Cubs recalled Megill from Triple-A Iowa on Saturday, Andy Martinez of Marquee Sports Network reports.
The righty has struggled mightily in the big leagues this season, appearing in 12 games for the Cubs and posting a 13.50 ERA in 8.2 innings. He most recently appeared in a game Tuesday, after which he was optioned to Iowa. Megill replaces Adbert Alzolay (hamstring), who was placed on the 10-day injured list.