#2 To test himself in another country
Griezmann left France to begin his professional career in Spain at the age of 14 with Real Sociedad. He has played in Spain for the past 14 years and now is the right time for the the 28-year-old to take on the challenge of testing himself in another league. Manchester United will provide him with the opportunity to compete in the best league in the world.
The Premier League has earned a lot of reputation during the past few years and attracted some of the finest superstars on the planet. The English top division is defined by its fast, intense football and huge competition which would be a different experience for Griezmann
That is one of the reasons why the attacker should stay away from joining Barcelona and instead, choose Manchester United.