Singer Jennifer Lopez had earlier expressed her desire to see him or Mick Jagger in her place as a judge.u00a0"Jon wouldn't commit to anything unless he can give 100 percent. With planning for the next album already underway, he's focused on the band."

"With all systems go for a new album and a mega-tour on the horizon, Jon wouldn't be able to give those aspiring singers the guidance they deserve," the source added.