Nabers (knee) was not spotted at the portion of Tuesday's practice open to the media, but he later took the field in uniform, according to Connor Hughes of SNY.tv.
The apparent absence raised some alarms after he said Monday he was unsure about his Week 1 availability, but Nabers was able to join Tuesday's session midway through. It's unclear how much work he will get in Tuesday, however. Nabers played only four games last season before suffering a significant knee injury.