Sergio Aguero came off the bench to hand Manchester City a 2-1 advantage in their Europa League tie against Porto.
The Argentinian struck from close range with six minutes remaining as City came from behind to condemn the Portuguese champions to a rare home defeat at the Estadio do Dragao.
The hosts took a 27th-minute lead in the first leg of the last-32 clash through Silvestre Varela but an Alvaro Pereira own goal gifted City an equaliser.