Bulls forward Luol Deng missed his 11th straight game on Tuesday night with a right calf strain.

Deng began running on a treadmill Tuesday and is "feeling a little bit better," according to coach Vinny Del Negro.

However, the team has no timetable for his return as their playoff hopes continue to dwindle.

"I don't want to say day-to-day; I don't want to say a week," Del Negro said. "He's got a little bit more time before he [comes back]. There's no target date. It's going to be how his leg reacts with the conditioning, running, cutting and moving. If it doesn't tighten up, we'll get him out there. If it does, we'll have to slow the process down."