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The highly-rated Norwegian internationalist arrived at Paradise from reigning Norwegian champions Stromsgodset, during the January 2014 transfer window.
The midfielder signed a three-and-a-half year deal with Celtic, becoming the fourth Norwegian player to join the club, following in the footsteps of Harald Brattbakk, Vidar Riseth and Thomas Rogne.
He has been capped for his country at senior level and made his first full international appearance for Norway in 2013.
Johansen quickly established himself in the Celtic first-team, scoring his first goal in the 3-0 win over St Mirren in March 2014. He followed that up with a goal the following week as the Hoops secured a 5-1 victory over Partick Thistle at Firhill that ensured a second championship medal to go with the one he won in Norway.
Johansen would come to the fore in his second season at Celtic Park as he was joined in Glasgow by his former Strømsgodset manager Ronny Deila.
The new Hoops boss pushed the Bhoys' No25 further forward into a more attacking role behind a main striker. This would help the 24-year-old find a goal-scoring touch with strikes against FC Astra and FC Salzburg in the group stages of the UEFA Europa League as well as goals agaisnt Aberdeen and Dundee United in the Scottish Premiership.