Cristiano Ronaldo left Al-Nassr’s game against Al-Ta’ee to use the training room.
The 37-year-old had watched the first 45 minutes in a VIP box, as he began a two-match suspension.
Ronaldo was banned by England’s Football Association (FA) for hitting a phone out of a fan’s hand after United’s defeat at Everton in April.
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While he took his place in the stands and waved to supporters ahead of the game, Ronaldo watched the rest from the training room.
The Saudi Arabian club posted a video of him applauding the second goal scored by Brazilian Talisca.
Talisca opened the scoring in the first half.
Ronaldo will also miss Al-Nassr’s next fixture on January 14 against Riyadh rivals Al Shabab.
With Friday’s win, Al-Nassr extended their lead at the top of the Saudi Pro League to four points over Al Shabad, having played a game more.