Rashford, 23, has come off the bench in all three of England’s Euro 2020 matches this tournament, although he is yet to score a goal.
The Manchester United netted 21 goals and 15 assists in all competitions at club level last season but has battled a shoulder issue in recent times.
Rashford revealed he has been playing through pain for an issue that may need an operation.
“It’s either an operation or I don’t get an operation,” he said.
“I’m not 100 per cent sure if I need it yet, so I’ll just take it as it comes.
“I’ll finish strong here and I’ve got a few weeks off to just relax and decide what I’m going to do.”
England qualified top of their group after 1-0 wins over Croatia and the Czech Republic along with a highly criticised 0-0 draw with Scotland.
The Three Lions will play Germany in the last 16 on Tuesday at London’s Wembley Stadium, with Rashford’s availability not in doubt.
Rashford added: “The doctors have not said yet (whether it needs to be surgery). The reason I don’t know is that when the season was going, and before I came here, I knew there was no chance I was going to be getting the operation, so I did not know how long the operation would put me out for.
“I am fully concentrated on here. When the tournament is finished, then I will ask the question.”