Ellenberger (27-5), who weighed the maximum allowed 171 pounds, looks to extend his win streak to seven with a win Friday. Kampmann (19-5), coming off a comeback win over Thiago Alves in his last fight, weighed 170 pounds.
It's unclear where the winner of this fight will stand in the division, with current champion Georges St. Pierre sidelined until later this year after ACL surgery. Interim champ Carlos Condit is expected to wait for his shot at the title.
"I think this should be a No. 1 contender fight," Kampmann said, earlier this week. "I've fought some of the best guys in the division and Jake has been on a tear as well. It's all up in the air with the GSP injury and Condit having the interim title.
"It all depends on when GSP is going to be back fighting again. If he's going to be out a lot longer, maybe Condit should fight. There are a lot of 'ifs' and 'buts.' "
Also on the card, TUF Live finalists Al Iaquinta (5-1-1) and Michael Chiesa (7-0) will compete to become the latest reality series winner. Iaquinta came in at 155 pounds; Chiesa at 156.