The Portuguese star was taking part in a Rondo ahead of their trip to Bayer Leverkusen in their final Champions Leaguegroup game on Wendesday.
The training drill sees circle of players attempt to keep possession of the ball with just one touch at a time as a smaller group of players tries to make an interception.
Ronaldo, put off as as a pass bobbled towards him, managed to get the ball stuck under his right foot as he tried to play the required first-time pass.
His team-mates saw the funny side, some jokingly holding their heads in their hands, but the team’s main man did not.
Clearly frustrated, Ronaldo proceeded to smash three balls into the air as the players around him laughed.
watch the video;