▁in ▁the ▁last ▁round ▁of ▁the ▁group ; ▁ ▁Fe wer ▁discipl inary ▁points ; ▁ ▁Draw ing ▁of ▁lots . ▁ ▁In ▁case ▁of ▁ranking ▁third - pla ced ▁teams ▁across ▁the ▁groups , ▁the ▁following ▁criteria ▁is ▁used : ▁▁ ▁Point s ; ▁ ▁Go al ▁difference ▁in ▁all ▁group ▁matches ; ▁ ▁Go als ▁scored ▁in ▁all ▁group ▁matches ; ▁ ▁Fe wer ▁discipl inary ▁points ; ▁ ▁Draw ing ▁of ▁lots . ▁ ▁Play - off ▁stage ▁ ▁The ▁number ▁of ▁play - off ▁stage ▁participants ▁depends ▁on ▁the ▁number ▁of ▁teams ▁advanced ▁to ▁A CL ▁group ▁stage . ▁▁ ▁In ▁case ▁four ▁teams ▁advanced ▁to ▁A CL ▁group ▁stage , ▁eight ▁teams ▁( top ▁two ▁teams ▁in ▁each ▁group ) ▁will ▁play ▁the ▁play - off . ▁ ▁In ▁case ▁three ▁teams ▁advanced ▁to ▁A CL ▁group ▁stage , ▁ten ▁teams ▁( top ▁two ▁teams ▁in ▁each ▁group , ▁and ▁two ▁best ▁third - pla ced ▁teams ▁across ▁the ▁groups ) ▁will ▁play ▁the ▁play - off . ▁ ▁In ▁case ▁two ▁teams ▁advanced ▁to ▁A CL ▁group ▁stage , ▁twelve ▁teams ▁( top ▁three ▁teams ▁in ▁each ▁group ) ▁will ▁play ▁the ▁play - off . ▁ ▁The ▁play - off ▁stage ▁is ▁played ▁as ▁two - leg ged ▁t ies ▁of ▁two ▁teams ▁each . ▁The ▁away ▁goals ▁rule , ▁an ▁extra ▁time ▁( away ▁goals ▁rule ▁is ▁not ▁applied ▁for ▁the ▁scores ▁in ▁the ▁extra ▁time ), ▁and ▁a ▁penalty ▁shoot - out ▁are ▁used