<Li> Champions Route, which included all domestic champions which did not qualify directly for the group stage . </Li> <Li> League Route (also called the Non-champions Path or the Best - placed Path), which included all domestic non-champions which did not qualify directly for the group stage . </Li> <P> A total of 57 teams (42 in Champions Route, 15 in League Route) were involved in the qualifying phase and play - off round . The 10 winners of the play - off round (5 in Champions Route, 5 in League Route) advanced to the group stage to join the 22 teams which entered in the group stage . The 15 losers of the third qualifying round entered the Europa League play - off round, and the 10 losers of the play - off round entered the Europa League group stage . </P> <P> Below were the participating teams (with their 2017 UEFA club coefficients), grouped by their starting rounds . </P>

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