Johansen signed a three-and-a-half-year contract with the club, and became the fourth Norwegian to play for Celtic following Harald Brattbakk, Vidar Riseth and Thomas Rogne.
Johansen firmou por tres anos e medio co club, converténdose no cuarto noruegués en xogar co Celtic tras Harald Brattbakk, Vidar Riseth e Thomas Rogne.