Cristiano Ronaldo shares post-workout picture alongside his son, Ronaldo Jr

Cristiano Ronaldo has taken to social media to share a post-workout picture with his son, Ronaldo Jr.

On Wednesday night, Ronaldo scored his 27th goal of the season as Al-Nassr moved into the quarter-finals of the Asian Champions League with a 3-0 aggregate win over Al-Fayha.

While some of his team-mates may have taken the opportunity to rest up following the victory, the former Real Madrid and Man United star has opted for the opposite.

On Thursday morning, Ronaldo shared a picture of himself topless, alongside Ronaldo Jr, after a morning workout session.

The duo, who wore just a pair of shorts, posed with huge smiles drawn across their faces as they stood in what appeared to be a home gym.

In a caption to the post, Ronaldo wrote: 'Today with my partner'.

Last month, Ronaldo Jr has invited comparisons with his father for his nonchalant behaviour during an Al-Nassr youth match.

The budding footballer, 13, cut a detached figure while playing for the Saudi Arabian side as an opposition player from Al-Shabab tried to chat with him.

Footage shows Ronaldo Jr putting his finger to his lips and peering out of the corner of his eye as the kid approaches him.

He briefly puts an arm around the neck of his opponent to acknowledge him before shrugging him off - and scarcely looks at him during the whole interaction, choosing to focus on the game rather than socialising.

Meanwhile, Ronaldo scored the only goal in the first leg of Al-Nassr's clash before then finding the net in Riyadh on Wednesday night with four minutes remaining of the second leg.

Ronaldo seized on a goalkeeping blunder to seal the win, tapping the ball into an empty net after Vladimir Stojkovic failed to clear a long ball for Marcelo Brozovic and allowed the 39-year-old a easy finish.

Stojkovic was also at fault for Al-Nassr's opener, as Otavio headed a cross from Abdullah Al Khaibari through his legs to put the hosts ahead 17 minutes into the game.

Ronaldo narrowly missed adding a second when his 37th-minute header clipped the post, before sealing his side's win.

The goal was Ronaldo's fifth in six AFC Champions League games this season and his 2th in 28 appearances in all competitions this season.

Al-Nassr are still aiming for a first-ever continental title and will take on Al-Ain of the United Arab Emirates in the quarter-finals next month after Hernan Crespo's side beat Uzbekistani outfit Nasaf through Soufiane Rahimi's injury-time winner.