The frustration wore on Dwight Howard and Mike D'Antoni.

Howard looked serious and sounded somber when he conceded uncertainty on when he'll return after sitting out of the Lakers' 93-82 victory over the Brooklyn Nets on Tuesday at Barclays Center. It marked the third consecutive game he's missed because of an aggravated labrum in his right shoulder. It's possible Howard will sit out when the Lakers play Thursday in Boston.

"I'm not in any rush," Howard said. "I want to make sure it heals up."

D'Antoni looked annoyed and sounded combative about a published report that indicated he and the coaching staff believe Howard needs to simply toughen up and return from injury.

"He's got the pain," said D'Antoni, the Lakers coach. "I don't have the pain. I wish he could play."

But Howard maintains that won't happen until he's completely healthy. He had a non-invasive platelet rich plasma procedure Saturday that entailed blood being taken and isolating the components in hopes of accelerating the healing process and relieving pain. It might take another week before Howard feels the effects, if at all.

Howard has aggravated his shoulder three times in the past month. His back surgery last season partly stemmed from playing through the pain, which only made it worse.

"It's my career," Howard said. "There's no need for me to prove anything to anyone."