Ronny Deila taking charge of New York City FC will likely be many things, but boring isn’t liable to be one of them.



Deila’s appointment as Celtic manager in the summer of 2014 came from nowhere, veering from hazy rumor to club confirmation within days. The frantic Googling that followed the Norwegian’s name being linked with the vacant job after Neil Lennon’s departure incited excitement among fans about this unknown from a distant land. He had led Stromsgodset, a small provincial club, to the Norwegian cup in 2010, and the league title in 2013 — only the second in club history — with a fraction of the wage budget of the more established elite, such as Rosenborg.



It wasn’t just his material success that was an attractive proposition. He had become renowned as an enthusiastic exponent of promoting youth, including fielding wonderkid Martin Odegaard (now starring at high-flying Real Sociedad on loan from Real Madrid) in April...