By Alek Arend Cristiano Ronaldo’s days in the Premier League could soon be coming to an end. The soccer superstar has reportedly asked Manchester United to let him leave if the club receives a satisfactory offer during the transfer window this summer, according to multiple reports. Ronaldo returned to Manchester United just a year ago, leaving Juventus in the process. The 37-year-old reportedly wants to leave the Premier League to finish out his career in the Champions League, according to The Times. “EXCLUSIVE: Cristiano Ronaldo has asked to be allowed to leave Manchester United should the Pr…