The Norwegian Under-21 international becomes the fourth shot-stopper on the MLS expansion club's roster.
Johansen, 22, joined the Premier League champions from local club Teie FC in August 2008 and signed his first professional contract in the summer of 2012 after impressing for both the Under-18s and reserves.
He made the first-team bench on a number of occasions but never earned a senior appearance for the club, instead taking in loan spells at Scunthorpe United in 2013 and Norwegian side Sandefjord in 2014.
With little chance of making the breakthrough at the Etihad, the Under-21 international joined NYCFC as a trialist during preseason and, after making a positive impression in his two appearances, has now made the permanent switch across the Atlantic.
Speaking to NYCFC.com on his move to the States, Johansen said: “I had a great experience working with squad and coaches during the pre-season and I’m excited to re-join the team on permanent basis. The quality of the training really impressed me, as did the way the team came together in such a short period of time.”
Head coach Jason Kreis added: “We had a good look at Eirik over the course of the pre-season, and he adapted well to the team and to our style of play. It’s always good to have strong competition for places in the team, and Eirik will add to an already strong group of goalkeepers vying for game time. It’s a long season and guys will get their opportunities for various reasons.”
With the addition of Johansen, NYCFC now have four goalkeepers on their roster, including Josh Saunders, Akira Fitzgerald and New York Red Bulls loanee Ryan Meara, leaving the promising shot-stopper with a tough task to break into the line-up.
Saunders, in particular, has impressed in starting the first four games of the club’s inaugural campaign, conceding just two goals to help Kreis’ side pick up five points.