Doha: Qatar became the first team to be eliminated from the World Cup on Friday after Group A rivals the Netherlands and Ecuador drew 1-1.
The Dutch and Ecuador each have four points, Senegal have three.
Qatar are without a point after they lost their opening game 2-0 to Ecuador and then went down 3-1 to Senegal earlier on Friday.
They cannot qualify whatever happens in their final match against the Dutch on Tuesday.
Qatar loses 3-1 to Senegal
Earlier, Senegal sent the host team to a second loss at its home tournament on Friday after seizing on a defensive error from the Qatar team for the opening goal in a 3-1 victory.
Senegal striker Boulaye Dia drilled in the first goal after defender Boualem Khoukhi tried to make a clearance under no pressure, didn't connect properly and landed on his backside.
The ball dribbled away from Khoukhi.
And Dia, grateful for the gift, lashed it in.
Famara Diedhiou made it 2-0 at the start of the second half with a header from a corner while two Qatar defenders failed to stop him.
Qatar was denied a penalty and the chance of the lead before Dia's goal, though, when Akram Afif was clear on the left and then knocked over by a charging Ismaila Sarr. Referee Antonio Mateu of Spain didn't award a penalty even though replays suggested that contact was made.
Qatar did at least score a goal through substitute Mohammed Muntari. He headed in to finally beat Edouard Mendy after the Chelsea goalkeeper had pulled off two world-class saves to deny Qatar, which rallied in the second half.
But Qatar's hopes of a fightback to boost its qualification chances lasted six minutes before Senegal substitute Bamba Dieng reestablished the two-goal advantage.