Nelson has a bruised patellar tendon in his left knee.
"He's day-to-day," Magic coach Jacque Vaughn said.
Rookie Maurice Harkless received his first technical foul Sunday.
Memphis' Jerryd Bayless hit a 3-pointer as time expired in the third quarter, and Harkless bounced the ball hard off the parquet floor, prompting it to go high in the air.
"I didn't even mean to hit the ball like that," Harkless said afterward. "I was hoping it would just bounce right back up, and I'd catch it. . . . It was just frustration."
Vaughn said: "He didn't do it towards the referees. It was just instinctive. He's a smart person, and when he sees his paycheck and that minus next to it, he'll realize that he'll be even smarter next time."
Al Harrington appeared in his fourth consecutive game Sunday, continuing his comeback from a vicious staph infection that took hold in his right knee last May.
Harrington, 33, has no plans to retire anytime soon, but he expects to expand his post-NBA options this summer.
He said he'll participate in the National Basketball Players Association's offseason Sportscaster U. program at Syracuse University. The seminar typically lasts three or four days and teaches current players about sports broadcasting.
"I'm going to take a shot at it and see if I really like it," Harrington said. "But it's something a lot of people told me that I should think about doing."
Harrington said his knee has responded well to his recent playing time.
"I'm just trying to get my legs under me and get my wind back," Harrington said. "I'm trying to get to the point where I can play more than 12 minutes and really contribute. It's a work in progress."
• Grizzlies power forward Zach Randolph didn't play because of a sprained left ankle.
• The Magic turned the ball over five times in the first quarter, leading to seven Grizzlies points.Copyright © 2015, The Baltimore Sun