Lennon has already recruited forwards Gary Hooper and Daryl Murphy but has sold Cillian Sheridan and allowed MortenRasmussen, Paul McGowan and Ben Hutchison to go out on loan.
The arrival of the trio on the final day of the transfer window comes after the signing of FC Seoul's Ki Sung-Yong, Thomas Rogne from Stabaek, Brondby's MortenRasmussen and Jos Hooiveld from AIK Stockholm.
Celtic's MortenRasmussen should have done better with a right-foot strike from the edge of the Hibs penalty area in the last few minutes of the game, but the visitors held out and interim manager Neil Lennon maintained his 100% record in charge of the Glasgow side.