Cristiano Ronaldo is reportedly being investigated for making an alleged offensive gesture while playing for Al Nassr in the Saudi Pro League.

Footage on social media appeared to show Ronaldo cupping his ear and repeatedly thrusting his hand forward near his pelvis, seemingly aimed at rival Al Shabab supporters.

The incident occurred on Sunday after Al Nassr beat Al Shabab 3-2.

In the background were chants of "Messi", for Ronaldo's long-standing rival.

While it was not captured by television cameras, criticism of the 39-year-old Portugal striker has been swift.

Local media reports said the Saudi Arabia Football Federation had opened an investigation.

He could face a suspension. Al Nassr's next match is on Thursday.

Ronaldo, who moved to the Riyadh-based club in December 2022, has a league-leading 22 goals. He also scored the opener against Al Shabab with a first-half penalty.

Al Nassr trails fellow league leader Al Hilal by four points, having played one more game.

Al Nassr is also in the quarterfinals of the Asian Champions League, a tournament it has never won.

AP