The Suns have released Luke Zeller to clear a roster spot for Marcus Morris, according to ESPN.com's Chris Broussard (via Twitter). Zeller's minimum-salary deal was guaranteed for the rest of the season, so he'll still be paid the full amount and the Suns will still absorb the cap hit.
Releasing Zeller allows the Suns to regain some leverage in trade talks involving Jermaine O'Neal and Sebastian Telfair. Had Phoenix been forced to move one of those two players to clear a roster spot, the offers likely would have been very underwhelming.
Zeller, 25, appeared in 16 games for the Suns this season, averaging 1.2 PPG in very limited minutes.