Omark had two assists in 13 games with the Sabres. The 2007 fourth-round draft pick was regarded as a disappointment after Buffalo gave up a conditional sixth-round pick in a trade with Edmonton on Dec. 19.
He has eight goals and 32 points in 79 career games. Should he clear waivers, Omark would have an opportunity to develop with the Sabres' AHL affiliate in Rochester.
The moves were announced Friday, a day after Buffalo closed its pre-Olympic schedule with a 3-2 loss at Ottawa.