The Norwegian joined Celtic during the January transfer and has already sealed a Premiership winner's medal while becoming an important midfielder for the club.
However, he knows that standards at Parkhead are exceptional and that he can't afford to rest on his laurels.
"I want to play but I want to earn my right to play in the team," he said. "For me, motivation is certainly not a problem.
"I believe there is more to come from me. I've only been playing for Celtic for a couple of months. I'm with new team-mates in a different league but feel I'm settling in every day."
Next up for the champions are two home games in a row, against Inverness Caley Thistle and Aberdeen, and there is only one aim for Johansen and his team-mates.
"We want to win our last four games," he told Celtic's official website. "That's the way it should be. This is what our incredible fans expect as they support us every week home and away."
Meanwhile, Celtic under-17s completed their Aegon Future Cup campaign with a penalty shoot-out victory after a 1-1 draw against Benfica yesterday. Steven Boyd scored for Tommy McIntyre's side.