Buffalo Sabres leading scorer Ryan O'Reilly will miss three to four weeks with a lower body injury.

Coach Dan Bylsma provided the update following a 4-3 loss to Pittsburgh on Sunday. O'Reilly did not play and was hurt in a 4-0 win at Columbus on Friday.

Bylsma did not reveal the nature of the injury.

O'Reilly's absence presents a big blow to a team that had been finding its chemistry. The Sabres had a 3-0-1 streak snapped and were 5-2-3 in their previous 10 games.

O'Reilly made his first All-Star Game last month. He leads Buffalo with 49 points, and also leads Sabres forwards in averaging nearly 22 minutes of ice time through 59 games.

The Sabres called up rookie forward Justin Bailey from AHL Rochester.