De Leon will likely start Monday's game against the Yankees, David Vassegh of 570 KLAC reports.
There was some speculation that De Leon could slide into Tuesday's start for Scott Kazmir (neck), but the 24-year-old will rejoin the rotation a day earlier than expected. De Leon pitched well in his major league debut, striking out nine in six strong innings, so he'll look to build off of that Monday in the Bronx.