The Red Devils shot-stopper has less than a day until Cameroon‘s tournament opener against Guinea.
Onana, 27, delayed flying to meet with his Africa Cup of Nations squad so he could assist United in a crucial match against Spurs.
And his help was much needed between the sticks as the Red Devils battled against Ange Postecoglou‘s side to secure a draw.
Erik ten Hag was desperate to put on a show as this was the first game Sir Jim Ratcliffe attended since his 25 per cent stake takeover.
While everyone left Old Trafford at around 6:30pm on Sunday Onana headed straight to the airport knowing Cameroon’s first AFCON game is at 5pm on Monday.
The United goalkeeper is expected to be benched in Cameroon’s Group C match against Guinea.
And instead his distant cousin Fabrice Ondoa, who plays in the French third tier, is set to take the No1 spot for the game.
Cameroon will also face Senegal and Gambia in their AFCON group hosted in the Ivory Coast.
Former West Ham and Liverpool star Rigobert Song will be leading the the Central African nation’s squad for the tournament.
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Onana missed Cameroon’s pre-championship game against Zambia to assist United in a 2-0 FA Cup third-round win against Wigan last week.
Now Ten Hag is left with his number two Altay Bayindir until Onana finishes his international duty.
The former Inter Milan star who has been key for United this season was welcomed to Old Trafford over the summer in a £47.1million deal.