Both Japan and Senegal had even goal differences and had scored four goals each, but Japan advanced as runners-up because they only picked up four yellow cards in the group stage, while Senegal had six.
The South Americans are now third and need a win in Samara to guarantee a place in the last 16, while the African side are second and will progress with at least a draw.
Meanwhile, NAIJ.com also reported that Japan lost 1-0 against Poland in the other game.
Another key moment in the first half of the game was the exit of Colombia star man James Rodriguez who was taken out after picking up a knock. But the Africans went out on fair play rules as they have received more yellow cards than Japan in the tournament.
Senegal's forward Ismaila Sarr (L) vies for the ball with Colombia's defender Johan Mojica during the Russian Federation 2018 World Cup Group H football match between Senegal and Colombia at the Samara Arena in Samara on June 28, 2018.
Colombia will face the runner-up of Group G, which will be either England or Belgium.More news: Romelu Lukaku grabs two, picks up injury vs Tunisia
The VAR system has not been universally acclaimed at this tournament, but television replays appeared to show Sanchez get his heel on the ball, before clattering into Mane, and after reviewing his original decision, Mazic agreed.
Colombia's football association has said the players who faced Poland focused on "regenerative" work on Monday.
The Samara Arena was then sent into a frenzy when Yerry Mina headed Colombia ahead from a corner on 74 minutes.
Senegal dominated possession in the remaining stages of the first half, but they were unable to carve out a chance as the sides went into the break goalless.
He won the Golden Boot at the 2014 World Cup and this latest setback came four years ago to the day since his wonder strike against Uruguay earned him the Puskas award for best goal of that year.
Akira Nishino's call to change his Japan team nearly backfired.