Pill, 26, was the Mets' fourth-round Draft pick in 2011. His career 4.01 Minor League ERA includes a 1.96 mark this season at Las Vegas, with 23 strikeouts and 14 walks in 46 innings.
The Mets next need a fifth starter Tuesday against the Brewers, and Pill would be a candidate for that start. They also need bullpen help; the team has used three or more relievers in a franchise-record 26 straight games, according to the Elias Sports Bureau.
Anthony DiComo has covered the Mets for MLB.com since 2008. Follow him on Twitter @AnthonyDiComo and Facebook, and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.