UNO's recent struggles have knocked it out of the top 10 for the first time this season.
The Mavericks (15-8-1) dropped to No. 12 in the USCHO.com rankings and to No. 11 in the USA Today/USA Hockey Magazine poll Monday after they were swept by unranked Miami last weekend.
It was the second time since the holiday break that UNO dropped both games of a National Collegiate Hockey Conference series at home. Denver, now rated 13th, swept the Mavs two weeks before.
UNO did have Tyler Vesel back on the ice at practice Monday after he missed Saturday's 7-3 loss to the RedHawks with the flu. David Pope also participated in half of the workout in a no-contact jersey. He sat out the Miami series after suffering a concussion at current No. 2 North Dakota the week before.
Goaltender Evan Weninger, out for the past two series with a sprain, said he's getting used to having his ankle taped and is hoping to make the trip to Colorado College with the Mavs this weekend.
UNO, 5-8-1 in league play, has dropped five of its last six games and is tied for fifth in the NCHC.