Man Utd star Luke Shaw's awkward tweets about Cristiano Ronaldo from 2013 resurface

Luke Shaw has risked Cristiano Ronaldo 's wrath as his nine-year-old tweets about the Manchester United superstar have come to light.

The duo have been teammates since Ronaldo, 36, dramatically returned to Old Trafford in a £20million transfer from Juventus last summer.

But the Portugal captain will be less than pleased to discover Shaw's take on his famous rivalry with Lionel Messi and verdict on his goalscoring prowess.

The defender, now 26, held little back in tweets posted while he was a teenager bursting onto the scene for Southampton that have subsequently been deleted.

Shaw was writing after Real Madrid defeated Barcelona in the Copa del Rey semi-finals in 2013, with Ronaldo scoring twice in the second leg at Camp Nou to fire Los Blancos to a 4-2 aggregate victory.

He wrote: "Not really a Ronaldo fan but fair play to him tonight. [He has] Always been in Messi's shadow, but the way he is playing at the moment is unstoppable."

Ronaldo put Real Madrid ahead from the penalty spot in the first half and added his second of the match shortly before the hour mark.

Then managed by Jose Mourinho, Los Blancos kept Messi off the scoresheet to eliminate the defending champions and reach the final, where they were defeated by local rivals Atletico Madrid.

Shaw faced criticism from other social media users for his remarks about Ronaldo, but he was adamant Messi is the greater player and pointed to his world-record 91-goal year in 2012 to illustrate his point.

When asked what Messi can do that Ronaldo cannot in March 2013, the Englishman hit back: "[He has] Scored 91 goals in one year. Has Ronaldo done that?"

Shaw's criticism of Ronaldo actually dates back even further to the previous year, when he was called out by