Iker Casillas – the competition's record appearance holder – laid the foundations for their victory with an early penalty save from Manuel Fernandes before Moussa Marega's successful spot-kick at the other end handed Sergio Conceicao's side the lead.

Hector Herrera doubled their advantage with a powerful header, but Lokomotiv's first goal of the campaign through Anton Miranchuk seven minutes before the interval offered them hope of reining in the Portuguese champions.

Jesus Manuel Corona put the result beyond doubt after 47 minutes, though, as Porto moved onto seven points after back-to-back Champions League wins, while Lokomotiv – who had Solomon Kvirkvelia dismissed 14 minutes from time – remain rock bottom of the group after three consecutive defeats.

Lokomotiv were gifted a golden opportunity to take a 10th-minute lead when Alex Telles tripped Aleksey Miranchuk just inside the penalty area. Fernandes' resulting spot-kick lacked power, however, and was pawed away by the evergreen Casillas.

Aleksey Miranchuk was then denied a certain goal by Telles' block on the line before Marega put Porto ahead in the 26th minute, coolly slotting into Guilherme's bottom right-hand corner from the spot after Eder had pulled Felipe back at a corner.

Herrera then doubled the Portuguese champions' lead in the 35th minute, heading in Corona's fine cross from eight yards for his second goal of their Champions League campaign.

The Russian champions bounced back just three minutes later, though, as Aleksey Miranchuk picked Eder Militao's pocket on the edge of the area and teed his brother Anton up to stroke past Casillas from 12 yards.

Their hopes of gaining a first point of the campaign were all but extinguished just two minutes after the interval when Corona latched onto Yacine Brahimi's throughball and unleashed a fizzing drive into the roof of the net.

The host rarely looked like setting up a tense finale and any faint hopes they had of clawing their way back into the game were ended when last-man Kvirkvelia received his marching orders for wiping out Herrera late on.