Boss Ole Gunnar Solskjaer will do everything possible to get Maguire ready for the May 26 final against the Spanish side in Poland.
And this means Maguire will miss Tuesday's home game with former club Leicester and Thursday's clash with Liverpool.
He is also unlikely to feature against Fulham next Tuesday or Wolves on the final day of the season on May 23.
Maguire is determined to win his fitness race but if the scan results show a problem, he will have to ensure he is ready for Euro 2020.
The centre-back had played every minute in the Premier League for United since his £85million move from Leicester in 2019.