Another day, another medical uncertainty. Nets guard Joe Johnson sat the last two games with a sore left heel. And while he went through the Nets’ light workout yesterday and “encouraged” coaches, he remains “questionable” for tonight’s game in New Orleans. “It went great. I felt good just getting out there,” Johnson said before addressing the key question of availability. “I’m not sure yet. We’ll see how it feels after a pretty strenuous workout. I’ll see how it feels in the morning and go from there.” Johnson was more optimistic than he was for Sunday’s game. “Hopefully I can get back as soon as possible, but right now I’m just trying to get back healthy,” said Johnson, whose big shot, big play capability was sorely missed in losses to Houston and Memphis. “If I come back too soon maybe it could get worse. This is not something that I want to linger over to the postseason.” Interim coach P.J. Carlesimo was the one “encouraged” watching Johnson. “He’s not jumping up and down but he’s moving around. ... [He’s] certainly less than 100 percent but I thought it went well,” said Carlesimo who’ll have fingers crossed today. “He may say it feels really good but he may not be able to get out of bed [in the] morning but we were encouraged.”