Paul Merson has shared his honest opinion on Manchester United and England international forward Marcus Rashford. The former Arsenal star and Sky Sports pundit has noted that Rashford has a lot of ability, but he wants the forward to start working hard. Merson made the comments about Rashford ahead of the Manchester derby between Manchester City and Manchester United at the Etihad Stadium on Sunday afternoon. Marcus Rashford is very likely to start for Erik ten Hag’s side, probably in a central striker’s role. The 26-year-old forward has been hitting the headlines for United in the build-up to…