Juventus may be without star man Cristiano Ronaldo for their Champions League quarter-final against Ajax as the forward is reportedly being investigated by UEFA for swearing at Atletico Madrid fans.

The Portugal international scored a hat-trick in Tuesday's last-16 second leg against Atletico to earn his side a 3-2 comeback win on aggregate.

Ronaldo was seen venting his fury towards the travelling Atleti fans inside the Allianz Stadium, allegedly shouting "hijos de puta", which translates roughly to "son of a whore", while also making a crotch-grabbing gesture.

Gazzetta dello Sport claims that the five-time Ballon d'Or winner could be hit with a suspension by UEFA if it deems the offence serious enough.

Atletico boss Diego Simeone was fined £17,000 for his 'cojones' gesture in the first leg.