Mengden will join the Athletics' starting rotation and draw the start for the second game of Saturday's doubleheader against the Astros, Jane Lee of MLB.com reports.
Mengden was recalled from Triple-A Nashville on Tuesday and will be deployed in the starting rotation in place of the struggling Chris Smith. Mengden posted a 6.50 ERA in his 14 starts last season and gave up nine runs in his two starts earlier this year, so he can be left off your fantasy radar until he shows he's capable of performing at the big-league level.