The 19-year-old Argentine capitalised on a mistake from City’s defence to open the scoring, before his fellow teen started and finished a stunning back-to-front move to put United two goals up before half-time.
Premier League champions City put the Red Devils under considerable pressure in the second half, pulling a goal back through Jeremy Doku late on, but United clung on to claim FA Cup glory.
Martinez, starting just his 11th game of an injury-ravaged season, was delighted with the impact of United’s two young stars, though warned them to keep their feet on the ground.
Asked about the two teenagers in an interview with Sony Sports Network after the game, Martinez said: ‘They deserve it.
‘For sure, we need to show them the way, how to do it, because it’s difficult for them, for their age, to control – because they become famous and this kind of thing.
‘So it’s really important to show them, to teach them, how to go out in a good way. So now, keep control. Celebrate, but with control.’
Martinez actually had to give Garnacho a little telling off on the pitch at Wembley and stopped his compatriot from kissing the United badge right in front of the City end following his opening goal.
On whether United can now use the FA Cup win as a platform for next season, he continued: ‘One hundred per cent.
‘Now it’s like the door is open and we need to learn about this season and we need to believe.
‘We need to believe like today. Football is mental and it’s about emotion. We need to believe. That’s it. And we have to look forward and dream big.’
After an injury-plagued campaign, Martinez only managed to last 73 minutes at Wembley before being replaced by Jonny Evans for the final stages after suffering from cramp.
Asked if he was exhausted by the time he came off, the Argentine replied: ‘Yeah because for me it was a really, really tough season.
‘You know, my injuries, and it’s all new for me, I’ve never been injured [before]. In the foot, in the knee, in the calf as well! It was like, “Is this a dream or what?”
‘And now I’m really strong, mentally and physically. Today, for sure, because I played only against Newcastle, Brighton and now the final, I felt cramp in my legs so I couldn’t finish the game.
‘That’s why I was unhappy, but I knew I have team-mates behind me and they gave everything.’
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