Ralf Rangnick faced with rift between Cristiano Ronaldo and Mason Greenwood as the youngster fumes.

Ralf Rangnick faced with rift between Cristiano Ronaldo and Mason Greenwood as the youngster fumes.

Manchester United are currently faced with a big challenge within the ranks concerning Mason Greenwood and club superstar Cristiano Ronaldo, according to reports.

The 20-year-old is seen as one of the best promising stars in world football, although he is aware that his playing time is limited at Old Trafford due to the arrival of Ronaldo.

According to El Nacional, Greenwood is said to be ‘upset’ by his lack of playing time and the fact that Ronaldo will always come ahead of him on the team sheet list.

The report also added that Greenwood is unhappy with the way the  five-time Ballon d’Or winner  took over united dressing room so quickly after returning to the club in the summer.

Mason Greenwood was a regular under Ole Gunnar Solskjaer ( Photo by Getty Images)

The English youngster was a regular under Ole Gunnar Solskjaer but has struggled for playing time under Manchester United’s new interim boss.

The arrival of the German tactician has brought about some positive changes, turning the fate of the wavering Red Devils, after their bad start to the campaign.

In addition, the report stated that Greenwood may even consider his future options, and a number of elite European clubs are believed to be closely monitoring his progress.

Arsenal are understood to be interested in signing Greenwood alongside Italian giants Juventus and Fc Barcelona.

Mason Greenwood signed an improved contract with United in February this year that runs until 2025.

In other news, Jesse Lingard takes final decision on his Manchester United future