The 36-year-old showed a rare lack of accuracy during shooting drills ahead of the game.
The 36-year-old is back at United after 12 years away, completing a remarkable return during the final days of the transfer window.
Ronaldo on Saturday made his second debut for the club against Newcastle, scoring twice in a relatively comfortable 4-1 win to re-introduce himself at Old Trafford.
He was back in the starting line-up on Tuesday as United kicked off their Champions League campaign in Berne against Young Boys, and in doing so matched Iker Casillas’ competition record.
Not content with being the all-time Champions League top scorer with 135 goals, Ronaldo has now made 177 appearances in the competition – matching his former Real Madrid team-mate.
He marked the occasion with the opening goal, slotting Bruno Fernandes’s pass through the goalkeeper’s legs.
It was better accuracy than before the game, when a wayward shot floored a security guard patrolling the edge of the pitch.
Ronaldo was quick to rush over to check on the man and apologise.
Source – Manchester Evening News