Amid all the fanfare, three goals in his first two games has seen the 36-year-old get off to a wonderful start during his second stint at the club.
While there are concerns as to whether or not his arrival is exactly what the team needed, as well as the impact of his presence demanding the team play in a certain way as was the case at Juventus, Ronaldo proving prolific simply isn't up for debate.
The forward, of course, did score on his first Champions League game for United since the 2009 final loss to Barcelona in Rome, although his evening didn't exactly get off to the best start.
Indeed, during the warm-up before United's shock loss to Young Boys, the Portuguese appeared to injure a security guard with a wayward shot.
Striking at goal in preparation for the game, his off-target attempt flew straight into the unlucky observer, knocking them to the ground.
Images on social media have emerged of Ronaldo going over to check on the individual, who he also gave his shirt to at the end of the game.
Thankfully, everything was ok and, at the very least, the security guard did get to take home something memorable.
Taking his Champions League tally up to 135 in his 177th game with an albeit scruffy finish, it was far from the perfect evening for United.
Following Aaron Wan-Bissaka's first-half red card, Ole Gunnar Solskjaer opted to bring Ronaldo off in place of Jesse Lingard, presumably to give his side more pace on the counter, although the England international's awful backpass led to defeat in Switzerland.News Now - Sport News