The attacker had to come off against Liverpool in a 2-2 draw in the Premier League on Sunday.
However, Rahsford has gone onto social media, posting that he will be okay to play soon enough.
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Whether Rashford has to miss one or two games is unclear, as manager Erik Ten Hag did not elaborate post-game.
Posting on Instagram, the 26-year-old wrote: Unfortunately, we couldn't see the game out. (Heart emoji) to my niece Natalia, my mascot for the day."
One fan responded: Hope you're okay Rashy," to which the striker replied: I will be okay!" with a praying emoji.