Clubs that finished in the top eight of the 36-team Champions League group table progressed directly to the last 16. The teams in the bottom eight were eliminated.
The remaining 16 teams that finished between ninth and 24th place progressed into the play-offs.
Of those 16 teams, the clubs that finished ninth to 16th in the league phase were seeded into four pairs for the play-off draw.
Those that finished from 17th to 24th were put into four unseeded pairs.
Unseeded teams were drawn against one of two seeded teams, with seeded teams hosting the second leg of the play-off as they finished higher in the first phase table.
City finished 22nd in the league table while Celtic finished 21st.
It meant the two sides would face one of Real Madrid or Bayern Munich, who finished 11th and 12th respectively in the group stage.
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