Ronaldo notched his 99th Champions League goal and his second of the evening after picking up a floated Sergio Ramos pass and shooting right footed past Bayern Munich goalkeeper Manuel Neuer.
Real went on to win 4-2 on the night and 5-3 on aggregate, Ronaldo scoring a hat-trick and his 100th Champions League strike – but his second should not have counted.
Replays showed Ronaldo standing a yard offside as the ball came over from Ramos, with Bayern’s defenders raising their arms, expecting a flag that never came.
The offside drew a furious response on social media, including from a player for Real’s biggest rivals, Barcelona.
Gerard Pique showed his disdain for the refereeing by simply tweeting ‘…’ – a near silent response which got a big reaction and was re-tweeted over 65,000 times.
This is what Ronaldo tweeted;
@Cristiano Another night to remember. Amazing win!! Great team work!