The Mets, in other words, will remain plenty flexible late in games until Mejia establishes his ability to pitch multiple days in a row.
"He hasn't been back-to-back in four years, so we've got to be careful," Collins said of Mejia, the favorite to close on days when he is available. "If it's not this weekend, next week he's got to go back-to-back sometime."
The Mets converted Mejia back to the bullpen earlier this week.
Anthony DiComo is a reporter for MLB.com. Follow him on Twitter @AnthonyDicomo. This story was not subject to the approval of Major League Baseball or its clubs.