Fans spot Cristiano Ronaldo's special reaction to Alejandro Garnacho copying his celebration

Cristiano Ronaldo's reaction to Alejandro Garnacho's goal and subsequent celebration was brilliant, as Manchester United rounded off their Europa League group stage with a win.

The 18-year-old started the game away against Real Sociedad and finished superbly from a Ronaldo through ball, as his 17th minute opener was enough to secure all three points.

Despite the victory, United finished runners-up in Group E on goal difference to the Spanish side, and risk facing one of the demoted Champions League teams - including Barcelona or Juventus.

But the young Argentinian has impressed in small cameos so far this season and last night was certainly his best moment in the first-team so far.

His goal may have caught the headlines, but it was his celebration that has gone viral as he had to ask the veteran striker for permission before emulating him.

Footage from BT Sport can clearly see the young star asking for permission, before Ronaldo breaks out into laughter and gives him a hug before he proceeds to face the United fans with the celebration.

Another photo sees Ronaldo pointing out Garnacho to Diogo Dalot & Bruno Fernandes to get their attention to say he's doing my celebration - in a very wholesome picture that sees Ronaldo acting as some sort of proud older brother.

One fan tweeted: "“Ronaldo telling Diogo Dalot & Bruno Fernandes that he’s doing my celebration is killing me.”

Whilst we're typically used to the now-iconic 'Siu' celebration from Ronaldo, his new viral trend of celebration was first seen during the 2-1 win over Everton last month.

Having spent time out of the first-team, Ronaldo scored a decisive goal and celebrated with Antony by leaning back with his hands on his chest - a celebration inspired by his sleeping position on planes and coaches on the way to matches.

Garnacho will be hoping to continue to learn from his idol, with last night being a great moment for the young star and he certainly has a big future.