The Nationals fear young wunderkind Bryce Harper may miss significantly longer than his 15-day disables list stay because of a thumb injury, sources say.

While Washington back-dated the 15-day allotment in case he's ready in a couple of weeks, there is concern within the organization he could miss several weeks.

That jibes with what unnamed Nats source told the Washington Post. "Doesn't look good," that source told Nats beat writer Adam Kilgore.

Harper is scheduled to see a hand specialist Monday, so there's still some uncertainty until that exam. The Post story mentioned Josh Hamilton's six-to-eight-week stay because of ligament damage in his thumb as possibly comparable.

Like Hamilton, Harper injured his thumb on a head-first slide. His injury occurred Friday night.

Nats manager Matt Williams told Nats writers the X-rays were "negative." But that doesn't mean the news will be all positive.