A team spokesman says the request was made Saturday and that team president Donnie Walsh will have discussions with Robinson's agent, Aaron Goodwin.
Robinson, a productive backup last season, hasn't played in the last eight games. Knicks coach Mike D'Antoni insists the benching isn't personal, only that he wants to use the players who give the team the best chance to win and that Robinson currently isn't one of them.
D'Antoni grew angry with a series of questions about Robinson's place in the rotation before the Knicks' 95-91 victory over the Los Angeles Clippers on Friday night.
"We're trying to win," D'Antoni said. "I can't explain exactly every second the ins and outs, and we were on a roll and that roll doesn't quit just because you lose a game. You see over time if this works or not."
A message was left with Goodwin Sports' office seeking comment.
Robinson is averaging only 10.9 points after scoring a career-best 17.2 per game last season. The two-time slam dunk champion re-signed with the Knicks on a one-year deal this summer after generating little interest as a restricted free agent.