Nothing separated the two sides after 90 minutes following their 1-1 draw with Casemiro levelling after Jesse Lingard’s opener.
And in the shoot-out, only three of the 10 spot-kicks from United and Real were converted.
Amongst the takers for United were new boy Victor Lindelof, Scott McTominay and Anthony Martial, who all missed from 12 yards out.
“I didn’t choose my best penalty takers.”
When quizzed on what his wider thoughts on the game were, Mourinho took a slightly critical tone over the second-half display.
He added: “It was a good training session.
Victor Lindelof missed a penalty in the shoot-out win over Real Madrid
“The players in the second half were disappointed not to play against their best players.”Manchester United will take on Real again in the Super Cup on August 8