Rashford, 23, was impeded by a shoulder muscle tear last season and was picked in England’s EURO 2020 squad despite not being 100% fit. He went through a scan on Tuesday and a conclusion was taken that surgery was the sole option. 
However, it is understood the operation will not take place for a couple of weeks. It is likely he will be out of action for 12 weeks comprehending the treatment, but has an outside chance of returning for United’s Premier League match against Liverpool at Old Trafford on 23 October.
The information is an additional blow to Rashford who has suffered a tough 48 hours since the final defeat at Wembley. He, Jadon Sancho and Bukayo Saka were targeted for racial insults online after they missed penalties in the defeat. 
Rashford’s mural in Withington, Manchester, was also vandalised but has since been covered in messages of backing by the community.