A pitcher, Niebla played in minor league baseball from 1998 to 2000 with teams in the Montreal Expos and Los Angeles Dodgers organizations. In 2009 with the Akron Aeros, Niebla replaced Tony Arnold as the team pitching coach. Niebla attended Azusa Pacific University.
On August 9, 2012, it was announced that the Cleveland Indians had fired pitching coach Scott Radinsky and replaced him with Niebla, from their Triple-A affiliate, the Columbus Clippers, on an interim basis.
Following the season, Mickey Callaway was named the permanent replacement.