Elieser Hernandez is first on the chopping block, getting DFA'd after Junis was removed from the 60 day IL and activated.
He won't be the last, either. Mitchell, Hall, Bukauskas and DWill will all be coming off the 60 day IL at some point in the next month or so. Every one of those guys will need a 40 man roster spot to open up.
Gasser will be moved to the 60 day, so that's one spot. Also, I'm not seeing what Jeferson Quero's deal is...it just says "minors" on the brewers.com roster page...but I'd imagine he could be put on the 60 day as well. Although there is something goofy about being injured long term while being on the 40 man but NOT the 26 man roster.