South African international Benni McCarthy has restored Celta Vigo's lead tonight - although Celtic still lead on away goals.
McCarthy came flying in at the near post to blast the ball past Douglas from close range after 53 minutes.
Latest score: Celta Vigo 2 Celtic 1 (2-2 on agg Celtic lead on away goals).
Celta Vigo: Pinto, Caceres, Berizzo, Mendez, Juanfran, Edu, Jose Ignacio, Lopez, Luccin, McCarthy, Jesuli.
Subs: Cavallero, Silvinho, Giovanella, Vagner, Jandro, Coira, Coudet.
Celtic: Douglas, Balde, Laursen, Valgaeren, Agathe, Lennon, Petrov, Sutton, Thompson, Hartson, Larsson.
Subs: Guppy, Gould, McNamara, Lambert, Maloney, Fernandez, Sylla.
Referee: Claus Bo-Larsen (Denmark)